Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9094d0771ac3f1d…

MALICIOUS

PDF

75.1 KB Created: 2021-06-08 07:51:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e10d5efb8e470d9b0b54a1bee5a94011 SHA-1: ac326087b8f2d1254cc7ea02110e73aedfd96016 SHA-256: a9094d0771ac3f1d0b7bab669e0df84fb7aae3bf858fa0ecfef1ba93f96a1e73
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-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://infrive.ru/pbw?utm_term=google+play+games+free+download+for+android+mobile PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4482407/normal_60177ed13e102.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382187/normal_6034c38a102f9.pdfIn PDF document text
    • https://vekenotagiwupas.weebly.com/uploads/1/3/2/8/132815979/dubipemakob-vibakuwusi-jivewex-defuvapi.pdfIn PDF document text
    • https://muvipedoboxeju.weebly.com/uploads/1/3/1/1/131163867/piraronukutogolagano.pdfIn PDF document text
    • https://naworetomepixi.weebly.com/uploads/1/3/7/5/137504938/55432.pdfIn PDF document text
    • https://pasoxogul.weebly.com/uploads/1/3/5/3/135399766/1992471.pdfIn PDF document text
    • https://nodimawajovuri.weebly.com/uploads/1/3/4/4/134431691/pipomufu.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/639348d0-3cb7-464a-803a-1356d5c418e0/voderepifetelolusadifa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/feaf3984-207a-4ac5-8c2f-5657b8c4764b/pozafori.pdfIn PDF document text
    • http://tukufidanega.pbworks.com/f/4547778416.pdfIn PDF document text
    • http://pazimonofe.pbworks.com/w/file/fetch/144739161/ropubejovifaj.pdfIn PDF document text
    • http://mituxap.pbworks.com/f/melowubolovalalegu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2efeada-b547-4d61-a049-57ace7913388/kowop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/517b960a-8212-4f24-aae4-ddd4e3a38786/36600402777.pdfIn PDF document text
    • http://detomipipu.pbworks.com/f/42311207594.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52bc989c-639c-4875-865a-6354e9f0a7fb/sorosivuramanuxamujugomo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ae7a6f6-d945-4799-bb8d-d1cb7b2c1ee2/car_aircon_repair_price_philippines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa6b7279-fad6-48a7-b0b5-a288aed23992/mini_14_hogue_stock_canada.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_off0000e8c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C2 5728 bytes
SHA-256: 3ad6091dc234e775385a0ff1029b6d95a5b6013ae85fba2c309a29314a7403ac
font_01_sfnt_off0000fc44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC44 10000 bytes
SHA-256: 1d00859f26b47df00d9c2dae3a13b3c9b65ece57fd9cd2c0585c4a64f09c3a02

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