Malicious PDF — malware analysis report

Static analysis result for SHA-256 87871c9257728a23…

MALICIOUS

PDF

82.0 KB Created: 2021-05-30 18:45:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: fad712ebb7d8a6565db9efe602d1e58a SHA-1: 4d9f5703ee20c677afc8585fd6d32d1f84f3cd8d SHA-256: 87871c9257728a231a2731bffa26e653ea639a1a96bcd6f91481ef87c9b16037
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 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/123?utm_term=bose+soundlink+color+2+bluetooth+speaker+manual PDF link annotation
    • https://zisojuvamifofe.weebly.com/uploads/1/3/1/3/131383842/7503536.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487658/normal_5fdbbdcab588b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402948/normal_5fdd864be1ff2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381340/normal_6061cc2875775.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420610/normal_5fced3edda3ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408346/normal_603bda8530bcc.pdfIn PDF document text
    • https://gasodugolulo.weebly.com/uploads/1/3/4/3/134375537/e3276c7a3d5d6a6.pdfIn PDF document text
    • https://jawuvufos.weebly.com/uploads/1/3/4/8/134856807/wuvutuluvesovazosepa.pdfIn PDF document text
    • https://bumeguzi.weebly.com/uploads/1/3/5/3/135391430/vigunako_jugejaveboz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491725/normal_60339f35956b4.pdfIn PDF document text
    • https://xuganozixebiwu.weebly.com/uploads/1/3/4/3/134311953/82266c03e40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365628/normal_5fe6c5f1726fa.pdfIn PDF document text
    • https://tilesutetogetu.weebly.com/uploads/1/3/4/0/134042518/540e9d8cbf6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482189/normal_602b5c2463f43.pdfIn PDF document text
    • https://fubupudixad.weebly.com/uploads/1/3/4/7/134742266/2183002.pdfIn PDF document text
    • https://denonifo.weebly.com/uploads/1/3/4/7/134709080/desub.pdfIn PDF document text
    • https://tasagimaxo.weebly.com/uploads/1/3/0/8/130813305/b8be9a0fed61.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/4051cffa-aa43-4f7e-83f5-47da65535d21/kafuwusedamuluzamok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c30fc8e-6e38-4032-bd4c-143f9190c524/45805124356.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C8 5700 bytes
SHA-256: 72e6da69360769a0cc5baa31cc0d4d77251c8983d814154eb4f9edfdac6444a8
font_01_sfnt_off000114f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F5 11012 bytes
SHA-256: aad6025423ee73f87138fb5f1e30cde6fb198f5f894960000dcee20415a2c8e7

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