Malicious PDF — malware analysis report

Static analysis result for SHA-256 efb1b32abd781041…

MALICIOUS

PDF

92.3 KB Created: 2021-03-18 19:10:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: fe3294a960fde10ab3a2f5e6536ebd82 SHA-1: b760a3181264641b36c083219a07b312e20eb640 SHA-256: efb1b32abd781041fcbf8110d09dc580dca0b715c4a254fde6ead2bc60209982
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to external resources, many of which are hosted on disposable domains or redirectors, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO spam. No scripts were extracted, but the structure itself is designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/wix?keyword=ffxiv+glamour+dresser+dye In PDF document text
    • http://yatvoyya.fun/alcoholics_anonymous_big_book_dictionaryjyj96.pdfIn PDF document text
    • http://gadatoreneperil.mygamesonline.org/vegetarian_ketogenic_diet_plan.pdfIn PDF document text
    • https://najememate.weebly.com/uploads/1/3/4/8/134867979/rawuxuretoxatowa.pdfIn PDF document text
    • http://mabay.fun/behringer_xenyx_1204usb_driver8ekod.pdfIn PDF document text
    • http://rogijowop.sportsontheweb.net/16959126012.pdfIn PDF document text
    • http://xolokeminapi.getenjoyment.net/68529961056.pdfIn PDF document text
    • https://jazawimap.weebly.com/uploads/1/3/5/3/135346256/9751441.pdfIn PDF document text
    • https://jobexukutet.weebly.com/uploads/1/3/1/4/131452991/dejaxupinife.pdfIn PDF document text
    • http://firstflirts.site/chemistry_an_atoms-focused_approach_3rd_edition_free8t8rl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://92ddf5cc-4ce7-4caf-b117-8241c553a727.filesusr.com/ugd/42bae0_69fc3e7f4b8344d484622b7f93b7f7f0.pdf?index=trueIn PDF document text
    • https://5a1138df-423b-4a5d-a7c7-36223740754e.filesusr.com/ugd/a72fa8_f81f9a6c51af4c3484a8711d82b0d2b7.pdf?index=trueIn PDF document text
    • http://xugejaf.rf.gd/soundlogic_light_up_rechargeable_wireless_bluetooth_speaker_manual.pdfIn PDF document text
    • https://f2d828cf-06d9-46ea-85af-d88b0bc20d44.filesusr.com/ugd/501a20_93abe3e57abb42b1b3f64a759f5fc370.pdf?index=trueIn PDF document text
    • https://4b5f4e46-8b81-4257-bf39-61fc08ba57b0.filesusr.com/ugd/7ea8bb_fe15e2a5447b4e05becbd1ef6dcbb394.pdf?index=trueIn PDF document text
    • http://laxolagodofomug.onlinewebshop.net/bacterial_artificial_chromosome.pdfIn PDF document text
    • https://3652d163-ddcc-4a12-b207-f1db22499277.filesusr.com/ugd/6c313a_cad397fa5ea446e98ca978252cabec40.pdf?index=trueIn PDF document text
    • https://36c7e617-1221-4173-b726-d5bce2878801.filesusr.com/ugd/610d21_57ca1edcc68b4a9c84caf84a331d616b.pdf?index=trueIn PDF document text
    • http://roxinus.rf.gd/sorodozavesetapozedumufor.pdfIn PDF document text
    • http://pegalisijeg.epizy.com/32874621537.pdfIn PDF document text
    • https://7a579b3f-ce96-4c66-abdc-991530493d29.filesusr.com/ugd/010c6b_5503796b3108428e840b98b66ecb4b3a.pdf?index=trueIn PDF document text
    • https://1682489e-d94b-4f22-b6a6-c8ecb623ca2e.filesusr.com/ugd/5f226e_c7b0be3796a743ddb44aab9726162bbd.pdf?index=trueIn PDF document text
    • https://88211235-bf86-4d40-a6ec-a052db2f682e.filesusr.com/ugd/94e5ef_ce4492055cc740768411dad2f7040525.pdf?index=trueIn PDF document text
    • https://fb5b3b17-6e6a-47c5-ae49-26eddba71e57.filesusr.com/ugd/aff7be_45fc028ce89240b2a835b1b59846c930.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12453 5412 bytes
SHA-256: 481b002aefdd8b677428a1daf8a321736c11e8cf11ae46f16966c27ea2c2ac5a
font_01_sfnt_off000136be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136BE 13848 bytes
SHA-256: 72c2c84a8a5b1829232e1259c4d06fdbd2d71356b7f0c3aec3fdb238a7d7d07c

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