Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f70f265dee94ffd…

MALICIOUS

PDF

77.3 KB Created: 2021-03-16 04:52:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: b10decdb8f27603504ce0e3f72618689 SHA-1: ad863091d00704544b2e94d9a4faa22a533ed747 SHA-256: 7f70f265dee94ffdd4c7a3e5d055a6551b03e699a37a73278a2205988817b936
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, with a primary one leading to 'baarspo.ru' disguised as a search result. Heuristics indicate this is a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. The ML classifier also flagged it with high confidence. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://baarspo.ru/wix?keyword=atari+breakout+hacked+unblocked PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4451368/normal_6038192296f0f.pdfIn PDF document text
    • http://zegobudipaju.mywebcommunity.org/top_business_management_books.pdfIn PDF document text
    • http://zozamowewideno.mypressonline.com/34710010717.pdfIn PDF document text
    • http://lotsmen.com/41918319209ork1v.pdfIn PDF document text
    • http://lovelid.xyz/banenedu2wo8k.pdfIn PDF document text
    • http://boxberry-24.cc/ripegejitepotujuvkf69g.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481168/normal_5ff1dc2a52161.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450502/normal_601bcfa64e5a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417033/normal_604f3b7489f31.pdfIn PDF document text
    • http://ekzo-fruit.ru/roludefosejevemnllo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://naxefugoxodikow.atwebpages.com/az_300_exam_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbea3d75-c7d2-4a72-9168-33f5406ec675/black_and_decker_gh3000_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9af92b13-b9ff-4b36-8603-ad3acc9204d5/relion_blood_pressure_monitor_error_codes_e4.pdfIn PDF document text
    • https://s3.amazonaws.com/falevi/lixizif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14c25e3b-0373-45af-ad99-9794ec21e165/what_is_sociology_and_anthropology.pdfIn PDF document text
    • https://s3.amazonaws.com/pidufozu/ropuxerozemegakijegavered.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46410d06-096f-4f0f-8945-551c102c2949/depojumudafezitigerewex.pdfIn PDF document text
    • https://s3.amazonaws.com/nagev/63881725922.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_off0000f2f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F2 5044 bytes
SHA-256: 8595a50b5e3020f70fb4f48cb1281de2e524236dc8d1665503b20392ea05f12b
font_01_sfnt_off0001040d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040D 10564 bytes
SHA-256: ff01530afcb19f759add1575177c56040d4dbaab665456ddc00e2a3fb18a7e0e

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