Malicious PDF — malware analysis report

Static analysis result for SHA-256 d03c9922486780c4…

MALICIOUS

PDF

86.1 KB Created: 2021-05-04 09:02:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 29acade310790680a42adafc184d7b83 SHA-1: 2b3ad2943a0b4246d5d058ec33651e13ef52efb5 SHA-256: d03c9922486780c4dac493651e72d10e3f7e40b8c60abb35a671048b30dbc086
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan delivery mechanism. It contains a large number of external links, many pointing to PDF files, suggesting a link farm or SEO poisoning tactic. One of the primary URLs, 'https://dafemum.ru/strik?utm_term=mini+dvi+to+hdmi+adapter+best+buy', is likely used to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://dafemum.ru/strik?utm_term=mini+dvi+to+hdmi+adapter+best+buy
    • http://gebuhrenfrei-mein.com/310382659323esg6.pdf
    • https://cdn-cms.f-static.net/uploads/4444638/normal_60490ef207c21.pdf
    • http://lyudi23.ru/mpdf_border_radiuscq2nv.pdf
    • http://winoorama.fun/52469016659m1r3a.pdf
    • https://cdn-cms.f-static.net/uploads/4414871/normal_5fdb3a7fc5f5e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/voropa/kawivesigatebux.pdf
    • https://s3.amazonaws.com/kuxuxemu/didowujekutim.pdf
    • https://d128792e-e0a8-46e0-98ed-b941f5da69b2.filesusr.com/ugd/b98abb_7eaee61db29c48aba662acbac081ad7b.pdf?index=true
    • https://03a45e23-20c9-4b13-8d21-50c2609e56df.filesusr.com/ugd/502f3d_e85014df7d0c4be7aa67f3a54c124d6d.pdf?index=true
    • https://s3.amazonaws.com/zuwosil/56152799385.pdf
    • https://s3.amazonaws.com/fadobirak/boferuzowepirup.pdf
    • https://13fad4bf-7224-44b3-802b-16842e97d241.filesusr.com/ugd/b14664_3189142e072742e2883566894a036ba7.pdf?index=true
    • https://7e005a1c-fb68-43c1-af83-b854b6a2d282.filesusr.com/ugd/dcfb95_88690f470ecc4a73b963de6fe0cc1544.pdf?index=true
    • https://s3.amazonaws.com/zunaporam/ford_mustang_shelby_gt500_0-60.pdf
    • https://s3.amazonaws.com/sepawi/79335743662.pdf
    • https://c96d0889-97fb-4213-90a4-a08ae01970e6.filesusr.com/ugd/ed32f2_da0b711ea4b44dafbaea7073038b6f1d.pdf?index=true
    • https://13006a6e-9b3f-4191-9e3f-064114488741.filesusr.com/ugd/34464a_7340ae161f0d40b3900a1549642517ab.pdf?index=true
    • https://s3.amazonaws.com/tozaduliwubega/backup_exec_licensing_guide_20._5.pdf
    • https://1f49b3f1-4b09-4f89-88df-03804352fc9a.filesusr.com/ugd/a51aec_d8f08645ea5e41c1bf416b94f31bdd28.pdf?index=true
    • https://a0f88182-e1f9-4a9c-ba22-d5ce004c6985.filesusr.com/ugd/2f3216_7cdf4877fd2047f194890b5a6e0f9ccc.pdf?index=true
    • https://s3.amazonaws.com/xakajoziwibi/tedifitazaguzixiluk.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_off00010dfe.bin
7f53e9664c81f95cdca352752590e9aab9111e7aa3a81f8a3a4d998ebce5cdc8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFE 5476 bytes
font_01_sfnt_off0001207b.bin
bffd18e37de815d29c3737f42a76aeaa705649de8096160373139c5bfa3ebeb0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1207B 12076 bytes

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