Malicious PDF — malware analysis report

Static analysis result for SHA-256 e078d12aef72fac1…

MALICIOUS

PDF

83.8 KB Created: 2021-04-16 02:33:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: bb1c479b0b8f6b89298aa6f44bc35297 SHA-1: b2abd5a5c97c0af0a37d5d6c3bc0c1b68f39afdf SHA-256: e078d12aef72fac16107aa873fb517185f9aa3c242069e96d2e437f00caf2606
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://kuzutuzo.ru/strik?utm_term=identify+tcp%252Fip+protocols+and+port+numbers+quizlet PDF link annotation
    • https://cdn.sqhk.co/bezorufuv/Ojaasij/vijajenor.pdfIn PDF document text
    • https://cdn.sqhk.co/vakolitakap/ifCUrI1/195562370.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391624/normal_5ffe8ae1c8e9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451374/normal_600b2d2e085f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421966/normal_604b363b5facf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366661/normal_605db1a980bf1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478123/normal_602f0e9baa931.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427268/normal_603381410a008.pdfIn PDF document text
    • https://cdn.sqhk.co/nawovoso/Fjhijgf/carx_drift_racing_lite_apk_hack.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475382/normal_5fe52bdbe7300.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381302/normal_604365dfbf226.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486563/normal_604dccfc0770a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454280/normal_5fd237bd5ab19.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9e705916-5bde-4eb8-be9b-8b3e910fbaf8.filesusr.com/ugd/c7a620_d09a49017da041869f2e4b05643b35dd.pdf?index=trueIn PDF document text
    • https://331e17ce-4321-42a7-89aa-067eaa3daeeb.filesusr.com/ugd/6576ad_a23f0df124d94530b3f596e0d2e3708d.pdf?index=trueIn PDF document text
    • https://3568c1c9-c281-4b9a-9ea9-d5d291e0176b.filesusr.com/ugd/e5d8db_ec23f72d765f497f96004e0c1ce631dd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/078dbe4a-0ddd-4863-8e06-ffd8ef485827/duzarewowatasalukasaro.pdfIn PDF document text
    • https://d0a6b1b1-1773-4622-8b5e-0ab5990a7ed3.filesusr.com/ugd/b90ba1_3e78d46741fe4cf79da5577394a3b1a0.pdf?index=trueIn PDF document text
    • https://13ea8442-998f-4f14-ba3b-7f37e53a414c.filesusr.com/ugd/008a9f_19d84b539f704d73b9d54f5fad3636be.pdf?index=trueIn PDF document text
    • https://52ed6390-a5c1-4502-9f93-599cf6d98ad1.filesusr.com/ugd/f7fbc8_187f2a0ee33e49b39b18a12bbdd3e088.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/195cf814-cb79-471c-9b12-475425c004e6/mazotipuka.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_off00010315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10315 5692 bytes
SHA-256: 98ad6b623967d3aeb77409987d8de493ad3e41c67cc20ee63357c845ed42f0d6
font_01_sfnt_off0001166d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1166D 12532 bytes
SHA-256: 90bbcaddef6c502316ca8df0859cb8b404ecfe7baad3757035597e272f0ba708

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