Malicious PDF — malware analysis report

Static analysis result for SHA-256 63d983758e28af4c…

MALICIOUS

PDF

73.7 KB Created: 2021-05-31 17:09:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 56a76621dab85ae2ea649777f20e8a31 SHA-1: 5636eac09be8aee0a42e926a7e44828245afdf66 SHA-256: 63d983758e28af4c8cda42ebfcf413ee9b306402de720b99144ff4e1203ca4aa
186 Risk Score

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 0.9997

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://bologen.ru/123?utm_term=best+pdf+to+word+converter+mac+free PDF link annotation
    • https://mojiwisixireze.weebly.com/uploads/1/3/4/6/134615440/4386775.pdfIn PDF document text
    • https://getaforufuzok.weebly.com/uploads/1/3/4/7/134733873/sazewabudo_kofefoka.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408853/normal_6006641261a55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417313/normal_6042f8d7a8878.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486054/normal_6057b62ecf96a.pdfIn PDF document text
    • https://goziluzigawu.weebly.com/uploads/1/3/2/8/132816100/7081384.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393209/normal_6001734db710f.pdfIn PDF document text
    • https://rizogedimawe.weebly.com/uploads/1/3/0/7/130739598/b98a7912cc4.pdfIn PDF document text
    • https://gerudupox.weebly.com/uploads/1/3/2/7/132712596/4358439.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366014/normal_5fd64a65557f4.pdfIn PDF document text
    • https://zatozidebowetam.weebly.com/uploads/1/3/1/3/131398213/womipogagu-disilo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386606/normal_600f246835944.pdfIn PDF document text
    • https://lilawowawumoxo.weebly.com/uploads/1/3/1/4/131453384/7723946.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392658/normal_5ff5a94f115ed.pdfIn PDF document text
    • https://wivexisi.weebly.com/uploads/1/3/1/0/131070498/2997887.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mumubib.pbworks.com/w/file/fetch/144413712/active_and_passive_voice_exercises_for_ssc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2dbc5cc5-544c-4d8b-ac07-fa4c57dd50ed/35999133916.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7496d4e9-364b-4193-bacb-6449122ba5e5/altec_lansing_life_jacket_battery_replacement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecbcdd15-3c2a-405d-aec8-3f00b26b47ba/4380832681.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7c2e4e1-1a4a-4780-99b0-6cd3096cd84f/98593386913.pdfIn PDF document text
    • http://nagomax.pbworks.com/f/zovikobusabik.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_off0000e266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE266 5472 bytes
SHA-256: de5f729c0b87c9961a3f555cfe04b7688ab8be5229aff256a010ea54a189c129
font_01_sfnt_off0000f506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF506 10772 bytes
SHA-256: 21accf62c5a003f78e042c5df24b16ae62facfc5ee153cd02b82b888bc0e956c