Malicious PDF — malware analysis report

Static analysis result for SHA-256 c555ac40d4abcfde…

MALICIOUS

PDF

77.0 KB Created: 2021-03-30 13:50:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 1b4ea49ede8449897619f870b7e0bbda SHA-1: 570cd1c71c63afdbef09f74db89011debf2afbff SHA-256: c555ac40d4abcfde6850858d3414afbaf2371127eaffcfe466a68a2458878049
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://botokaw.ru/award?keyword=powerscore+logic+games+pdf PDF link annotation
    • http://zitalogeloluwiw.mygamesonline.org/gipiwojupowe.pdfIn PDF document text
    • https://lenexemumuvag.weebly.com/uploads/1/3/1/4/131438583/fagobivetifavuxal.pdfIn PDF document text
    • https://dugigoje.weebly.com/uploads/1/3/4/7/134754128/vadiwizekasi-lavopexa-miposuxij.pdfIn PDF document text
    • http://rasipafus.getenjoyment.net/wavelet_image_compression.pdfIn PDF document text
    • http://mezogevap.mypressonline.com/certificato_di_conformit_impianto_elettrico.pdfIn PDF document text
    • https://xijafidul.weebly.com/uploads/1/3/2/3/132303061/jenobevogidoxixa.pdfIn PDF document text
    • https://popogupu.weebly.com/uploads/1/3/1/3/131398113/42d36.pdfIn PDF document text
    • https://rejowuboxobe.weebly.com/uploads/1/3/2/6/132680789/6991370.pdfIn PDF document text
    • https://cdn.sqhk.co/kezixowog/jjfDgiN/vector_pinball_github.pdfIn PDF document text
    • http://misifebofol.mywebcommunity.org/print_web_page_to_as_it_appears.pdfIn PDF document text
    • https://cdn.sqhk.co/tuwetebep/QKQgdgd/prank_caller_apk.pdfIn PDF document text
    • http://joxesozijemago.iblogger.org/injustice_2_scarecrow_guide.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbb9ae0a-e709-4a32-a219-409b8ecaa3cb/nikon_l35af2_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4665df51-2c52-4398-821c-e004bf68e334/pofuzaj.pdfIn PDF document text
    • http://muburenimigalu.epizy.com/28091491148.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7834987f-012a-4ec5-b8ef-48dcad5b6714/employees_synonyms_and_antonyms_list.pdfIn PDF document text
    • http://zikofizoredu.rf.gd/activetcl_8._4_for_windows.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7faf708-35d8-42c4-a819-3b163ca3d64c/is_sage_crm_any_good.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed0a18e5-5f65-4850-af81-6a6cb8012fce/42002563501.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d709945-a5b6-4d6d-a2c2-4672716a43e5/whats_another_word_for_sunshine.pdfIn PDF document text
    • http://weloridotam.epizy.com/adform_rest_api.pdfIn PDF document text
    • http://gatanugirax.rf.gd/3822361540.pdfIn 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_off0000ec9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9D 5568 bytes
SHA-256: 85399c4c831b552ca0f49b7217ab403aafab79c3a53a8b9fcf658a9e106a7050
font_01_sfnt_off0000ff89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF89 11032 bytes
SHA-256: b5926107e4a4d9800e7dbb19582db9ede42e840cd7b1b38b8cd4e02eb758aaff

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