Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d3f117671c4f544…

MALICIOUS

PDF

72.8 KB Created: 2021-03-17 19:46:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b8cbe3cd0a9322c296f9767ea144e7fc SHA-1: 34491691c4abe9cbd3660dac26c6878f45efb3a9 SHA-256: 8d3f117671c4f54400675b7ef3549c7531c7c82cf8008044365e0073e369c759
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, flagged as a link farm, and is detected as malicious by ClamAV and an ML classifier. The document body is heavily obfuscated but appears to contain keywords related to instructions, suggesting a lure. The presence of embedded URLs indicates an attempt to redirect the user to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/wix?keyword=westinghouse+digital+timer+t26425+instructions
    • https://vesokawewewavi.weebly.com/uploads/1/3/1/3/131382886/zizim_wokupuvik.pdf
    • https://cdn-cms.f-static.net/uploads/4412780/normal_600fc95d4ba07.pdf
    • https://cdn-cms.f-static.net/uploads/4377905/normal_5fe8061a9ef0a.pdf
    • https://cdn-cms.f-static.net/uploads/4368759/normal_60224d5012ed9.pdf
    • https://cdn.sqhk.co/vemegunir/dXhcQ1d/xuzawizodedos.pdf
    • https://gebomatera.weebly.com/uploads/1/3/5/3/135396668/4fc8228083.pdf
    • https://cdn-cms.f-static.net/uploads/4494677/normal_6016b8650bd35.pdf
    • https://folimigoti.weebly.com/uploads/1/3/4/8/134873615/1ef0a93b17a.pdf
    • https://cdn.sqhk.co/nobipajami/aiiHihi/52418641220.pdf
    • https://cdn.sqhk.co/murafabu/jwidjhi/best_black_forest_cake_near_me.pdf
    • https://jukudedavat.weebly.com/uploads/1/3/0/9/130969580/kiruwaxoxav.pdf
    • https://vomodubezu.weebly.com/uploads/1/3/5/3/135398809/wuwederubexik.pdf
    • https://cdn-cms.f-static.net/uploads/4449422/normal_602ae634776aa.pdf
    • https://cdn.sqhk.co/zuxosutuku/jcjjhcp/backcountry_movie_parents_guide.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://8a7e94d2-1b07-4399-8a7b-cfebf1eb419e.filesusr.com/ugd/e78b77_3158878be27443bb92283e85abb87b84.pdf?index=true
    • https://92ddf5cc-4ce7-4caf-b117-8241c553a727.filesusr.com/ugd/42bae0_0351bd58f4304a418fe2c76c8e40d121.pdf?index=true
    • https://s3.amazonaws.com/tabobujimo/sugivokixaxufafolekak.pdf
    • https://2ea9429b-0332-4ee6-bb75-ab9535b56c99.filesusr.com/ugd/e2f7e1_c3a010a8ab9f46e8ba76b77b2f053a26.pdf?index=true
    • https://s3.amazonaws.com/dinisemowoge/bed_sheet_design_pics.pdf
    • https://59cf682b-6680-4a08-8b8d-0472bab64ef7.filesusr.com/ugd/d7d6cd_76d89b6bc19b4df480bc57207566019b.pdf?index=true
    • https://4f65501f-cdae-4966-b9db-49b15ad9d196.filesusr.com/ugd/52b593_52f704b698e548fa948f1b75d1c3b74e.pdf?index=true
    • https://s3.amazonaws.com/sutawowirosuvuv/lg_company_introduction.pdf
    • https://ef2e072a-e8a2-4438-804d-cc750be2e2f6.filesusr.com/ugd/6a22cb_329d8bb0218d4726b0030f6b2e5b39e7.pdf?index=true
    • https://s3.amazonaws.com/farefasejikap/priston_tale_aging_guide.pdf
    • https://184d393c-d2ff-49e5-bbcb-48626b1dbf88.filesusr.com/ugd/49be48_d818d0665c8f4196af2ffdcffbc18fee.pdf?index=true
    • 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_off0000da8d.bin
743044ecca541d46fd97a6a4edcbafd8d5dd6feb13573579ce7aac92fa3876b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8D 5864 bytes
font_01_sfnt_off0000ee71.bin
92f4acb6ad8d670d1903fbb0c532b07a6c3d8c2b580b386f1aac3a1324ac719d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE71 10916 bytes

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