Malicious PDF — malware analysis report

Static analysis result for SHA-256 17791139309cbda8…

MALICIOUS

PDF

77.2 KB Created: 2021-03-20 20:57:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 446fea80aca1f57d18257ea5b6fcd213 SHA-1: 161e8b97447e435b416ca6554bd9cedf881d35fc SHA-256: 17791139309cbda8a0f11736cbbc0b1020c5318e7b6e6651cc93543d03e7c8d7
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 0.9997

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://midufefew.ru/strik?utm_term=how+to+pair+ge+wireless+door+chime+19247 PDF link annotation
    • http://pubgucbayim.com/3255589462p5bwz.pdfIn PDF document text
    • http://g2am2e.xyz/28233840826swd1g.pdfIn PDF document text
    • https://fakilopatezi.weebly.com/uploads/1/3/1/6/131606638/5529846.pdfIn PDF document text
    • https://rowevopa.weebly.com/uploads/1/3/1/8/131872281/9fb3c8635abe91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426955/normal_6034588c2dc23.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480898/normal_600c2135266b9.pdfIn PDF document text
    • http://geosen.net/rizuporapaz69v7s.pdfIn PDF document text
    • http://akmurzina.com/chick_fil_a_team_memberh2a2b.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/2dc09567-2814-4424-b132-225d54982f75/soundarya_lahari_sloka_95_in_sanskrit.pdfIn PDF document text
    • https://s3.amazonaws.com/tugumeb/3830522083.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e30abe0-e971-46cf-94cf-4bb4660fabb1/jidala.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fd67651-eb96-483f-8e60-58d86df1da0d/2005_ford_crown_victoria_repair_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/985fe894-b8f9-4b5b-8370-2458a556ebf3/is_grilled_teriyaki_chicken_from_panda_express_healthy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05202d97-592f-4fc9-91ff-0c681e356f5a/newtons_three_laws_of_motion_quiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96cb0817-d34b-43b1-a3f9-2e994388bd4a/zejazafovutasudujekil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83d466dd-df08-4511-b429-2c5e9d76c217/jibudibe.pdfIn PDF document text
    • https://s3.amazonaws.com/tulosa/simosimodupimeselilin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9d20a6a-458d-4f0b-ae4b-16fca8a8d597/skyscan_atomic_clock_manual_87800.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5676baf5-ad37-4ce5-9af6-303f50d691b1/68938075446.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/772723fe-eed6-4538-b0f7-feffa0c40829/resitinasereju.pdfIn PDF document text
    • https://s3.amazonaws.com/wupixufekijax/ver_video_globo_reporter_ontem.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_off0000eb42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB42 6048 bytes
SHA-256: d601f25ee80e0cfabd81c06f33a8c0aecab3f74f7c73efaa2f4c74ac43531919
font_01_sfnt_off0000ffcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCF 11700 bytes
SHA-256: e460903ef7e723642a8d15fedd6b3ac2e5c0fcc055fc1e6e6ee3e357d8a30790

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