Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6f5089c7b3796cd…

MALICIOUS

PDF

82.9 KB Created: 2021-03-14 16:20:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: f8c5f21fdac4fb4772a362881f03c9d9 SHA-1: 91cfeabaf604f5a7f0432f8360cc611b4d2b27fc SHA-256: c6f5089c7b3796cde996435eaf079c7ccbf66bbbf312326bafe50e54e1494551
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV also flagged this file as malicious, specifically as a phishing trojan. While no scripts were extracted, the presence of numerous external links suggests an attempt to redirect users to malicious sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 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.
  • 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://seumenha.ru/123?utm_term=cerebral+cavernous+malformation+hereditary PDF link annotation
    • http://livecopyrightverification.com/conan_exiles_cheats_single_player8r34x.pdfIn PDF document text
    • http://strgb2.ru/xibajetubo3mm8e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416932/normal_5fca7c8c01e76.pdfIn PDF document text
    • http://fringigejy.site/2nd_grade_math_georgia_standards_of_excellencefbkzb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386849/normal_6004b1fc462e8.pdfIn PDF document text
    • http://pl50off.info/kuginorogutrsqfl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6f81cef9-66a2-447d-9e1d-4c0427ef15c5.filesusr.com/ugd/4d935e_0ccba27b61c844579fe88d23e1fa23aa.pdf?index=trueIn PDF document text
    • https://e6c529cc-411f-4195-b5ea-7b5fd081490a.filesusr.com/ugd/b7ab08_733ee18947e74d379842b824a19da3f0.pdf?index=trueIn PDF document text
    • https://f4ef19d8-372f-49db-bbb6-0f5e16bfa625.filesusr.com/ugd/070799_4884ffc3e3084f578a1ff65c4e2c14a4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jeponowon/bafatilur.pdfIn PDF document text
    • https://s3.amazonaws.com/wazagidonux/zazanakivulotepe.pdfIn PDF document text
    • https://s3.amazonaws.com/lefemijip/nmims_bangalore_placement_report_2016.pdfIn PDF document text
    • https://s3.amazonaws.com/muwomapotumugi/sogebafinuxago.pdfIn PDF document text
    • https://21e323bd-7fdd-46e9-a6c7-4880e76d7610.filesusr.com/ugd/0a51c1_8371d5aa523c4646b96b323ea96be9b7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/juvuraguvutoxif/43639420956.pdfIn PDF document text
    • https://s3.amazonaws.com/filidabut/sub_zero_wine_fridge_reviews.pdfIn PDF document text
    • https://03f57db0-fbcf-46ec-8713-21b5992b8512.filesusr.com/ugd/455f95_b35947477fce4fe4829b1be03b7eb77a.pdf?index=trueIn PDF document text
    • https://0e75ab8e-f6a1-4360-bef2-1d94e06fde4e.filesusr.com/ugd/c0518c_f685ac827cb0431d9af7328334cfac2d.pdf?index=trueIn PDF document text
    • https://4c982f7a-b72b-446d-8c7a-5e2d6818c0db.filesusr.com/ugd/519a61_c22902595b894300b750163de7c1504e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/safenalavojuwu/55256932256.pdfIn PDF document text
    • https://44bb6ee8-a0fe-4f72-890f-0f0a2fec05cf.filesusr.com/ugd/b65acf_1145b517620f4fa6a30033fbb13b08e2.pdf?index=trueIn PDF document text
    • https://ef733714-782c-48ea-8991-1bc0bf0c95f2.filesusr.com/ugd/ad2ade_b7c1bb116dcd403d99e06fd4834148f0.pdf?index=trueIn PDF document text
    • https://4cf2acc4-d143-4013-a78d-f21de0873c4f.filesusr.com/ugd/e4636f_0f4da1023fe04ff8bb3fa956626e9fe3.pdf?index=trueIn PDF document text
    • https://medlineplus.gov/genetics/condition/cerebral-cavernous-malformation/In 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_off00010611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10611 5468 bytes
SHA-256: 9e26b49b7037f1fae3ea4ab59e0e2e4601591ae95469ecb3c0f058dafdf31357
font_01_sfnt_off00011884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11884 11096 bytes
SHA-256: 57d8bcee8deb983b1b2ad6b213d1881ba501efa9e8b4d303b5d6b6310dc0928c

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