Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c7ffc2a133afc49…

MALICIOUS

PDF

76.6 KB Created: 2021-03-12 17:25:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b80ad0c1dc8a153f56f2d6e4c1fbb696 SHA-1: 1ec5e30941638feb3806498f30e19eeed12353b7 SHA-256: 1c7ffc2a133afc49491a4068bacd3de548cc41d4ae48a80b685d45a6fe53df23
146 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm or phishing operation. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, and the presence of 'Candy blast game' in the document body, alongside numerous links, points towards a lure for users to visit potentially malicious sites.

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 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://xezojetit.ru/123?utm_term=candy+blast+game
    • http://zozavelomidabi.scienceontheweb.net/5037926214.pdf
    • https://dolafevofi.weebly.com/uploads/1/3/5/3/135330218/xavekimipaxowoviv.pdf
    • http://nituzovido.getenjoyment.net/gejuwudamefobe.pdf
    • https://ritojajugub.weebly.com/uploads/1/3/5/9/135984917/dosafud.pdf
    • http://kudikadip.getenjoyment.net/how_much_is_a_smart_repair.pdf
    • http://bufezipuduxev.mywebcommunity.org/commas_with_appositives.pdf
    • https://cdn-cms.f-static.net/uploads/4424933/normal_5fd15f6a5b9f0.pdf
    • https://movediwifed.weebly.com/uploads/1/3/2/6/132695881/8450328.pdf
    • http://mamefumiwuto.mywebcommunity.org/65086537168.pdf
    • https://kukonite.weebly.com/uploads/1/3/4/6/134611202/23769a56f5a498a.pdf
    • https://static.s123-cdn-static.com/uploads/4465394/normal_6005762169610.pdf
    • http://vukuradi.mygamesonline.org/how_do_you_renew_your_notary_in_nc.pdf
    • https://cdn-cms.f-static.net/uploads/4427523/normal_6043f1f166f97.pdf
    • https://fobabunopana.weebly.com/uploads/1/3/0/9/130969757/jotinodivufogaf-xiwezutuw-xetorexilerekeb.pdf
    • https://cdn-cms.f-static.net/uploads/4479223/normal_603b267ad1325.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://susabumo.atwebpages.com/vezetojamufisepum.pdf
    • https://uploads.strikinglycdn.com/files/b5695f68-73ca-4ca5-8593-5ad5b62559bf/68198286040.pdf
    • https://uploads.strikinglycdn.com/files/2625ea9e-fbe0-4bc1-8173-bb94b638d101/blue_jackets_vs_blackhawks_prediction_1_31.pdf
    • https://uploads.strikinglycdn.com/files/68900519-abe7-4bb3-b51f-5db859702833/is_wood_ox_lucky_in_2021.pdf
    • https://uploads.strikinglycdn.com/files/6b1d3386-c66b-4b8f-b800-a24f94e3d812/zitifuled.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed1f.bin
37b775768cce7945d216f0483fd4cf9294f9f6388d66c364ee3e9bf105cbd868		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED1F 5196 bytes
font_01_sfnt_off0000febc.bin
c5a65a935948f39f7109e3ce9fbe3e2458d9f236aa8a90d6e95124a9825a29bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBC 11512 bytes

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