Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e1f594577ca7c3a…

MALICIOUS

PDF

90.2 KB Created: 2021-04-03 07:09:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 2a86f88cea519f49cd2d8dbffc789284 SHA-1: 7ae4810632799ac77b934b527996b4be545c5a50 SHA-256: 4e1f594577ca7c3aa9d80f2525ac546dc8ef237bbcde7db252fd4294c20cfbdf
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, with a significant number pointing to disposable domains and potentially malicious content, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV also flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and the nature of the links suggest an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://xajibur.ru/wix?keyword=fish+cheeks+packet+answers PDF link annotation
    • http://tunabamilusi.mypressonline.com/bank_customer_service_representative_job_description_for_resume.pdfIn PDF document text
    • http://raxewapikeb.mygamesonline.org/drug_today_book_2020_free_download.pdfIn PDF document text
    • https://gajinuware.weebly.com/uploads/1/3/4/5/134597963/ec50b21ea3.pdfIn PDF document text
    • https://katalulipof.weebly.com/uploads/1/3/2/7/132710678/6923116.pdfIn PDF document text
    • https://nadarikiwuxat.weebly.com/uploads/1/3/2/7/132712530/fbadb3e42ee8e8b.pdfIn PDF document text
    • http://ruxuzosok.mywebcommunity.org/pafejupobabenileli.pdfIn PDF document text
    • http://vukufitu.mywebcommunity.org/doxovisigedupuv.pdfIn PDF document text
    • http://jarewitof.mypressonline.com/fewaziburevogudamomi.pdfIn PDF document text
    • https://bododomeliba.weebly.com/uploads/1/3/1/4/131408614/kokesanezeruz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/rorives/74002597730.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bb28167-e141-4778-b5a2-71b2e8302eb7/what_inspired_william_shakespeare.pdfIn PDF document text
    • https://720c7b34-a033-4bf0-83ea-6be17de98aa2.filesusr.com/ugd/03ef8e_58c6aea3ddf8421fbc9f9ef3778328b8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f36b0aa0-c4d4-42a9-abb9-09f8e7caba30/tagoni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbb09648-cc14-4f12-a7cf-ebb282f23729/asus_rt-n66u_dual-band_wireless-n900_gigabit_router_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/xakapudakadu/11445748162.pdfIn PDF document text
    • https://s3.amazonaws.com/dewazewokib/what_is_an_example_of_a_counter_argument.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd122bfe-b734-4382-aa5e-92f3433b762d/how_to_deep_clean_brother_printer_dcp-t700w.pdfIn PDF document text
    • https://40785fcd-1e5e-4316-9306-5db1d5795eae.filesusr.com/ugd/2f07a1_585210e16cd64f6eabe7ff71fb781da0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/29339040881.pdfIn PDF document text
    • https://e22e8d81-f41f-4d51-abb1-39b19d2d32bb.filesusr.com/ugd/96bf9d_5beef67429024b62ae5d1e240e8de336.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gorajikunobixi/10792626266.pdfIn PDF document text
    • https://203e60c5-e32a-4587-ab6d-31d66de6d5b9.filesusr.com/ugd/014c36_4773c41ae7004b4aac2b04ab0d78346f.pdf?index=trueIn PDF document text
    • https://a7ed8af5-5e4a-4eaf-98d7-51655494ca15.filesusr.com/ugd/b5c45a_e3e87852365d49cdb9e290fabef0c9ce.pdf?index=trueIn PDF document text
    • https://5ce19dfa-329f-495d-88d1-e1e7834d9072.filesusr.com/ugd/d902bb_c90e3a04c66542b289f37cb2274a037e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2702cb18-3f1f-41be-a992-6fa1771b1590/najiwixizawuva.pdfIn PDF document text
    • https://645c32c3-7e99-4959-b93b-7980205539d7.filesusr.com/ugd/30a31c_2d4fae642a4a4cfcab2ca3f750952837.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11524 4776 bytes
SHA-256: ca22b2693d08ce48c18255811ecd1544bc00d74536794efeb9588e062442d0d4
font_01_sfnt_off00012559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12559 11148 bytes
SHA-256: 89ba9f7d986c5369dfa4f26f1830514401182da47f07157e2ea15cdc6495e84c
font_02_sfnt_off00014b8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B8A 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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