Malicious PDF — malware analysis report

Static analysis result for SHA-256 955b2026bf5210ad…

MALICIOUS

PDF

76.4 KB Created: 2021-03-01 08:46:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23b817a8dbf04076403c1271ff468bef SHA-1: 59238589194af7de70164c85c6f1903160ac2fc4 SHA-256: 955b2026bf5210adc7c3b014d5b44d2f5627a8c91e14a318def9d67d4fc39d5a
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of numerous external URLs points towards a malicious redirection or content hosting scheme, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/aws?utm_term=2008+ford+escape+oil+type
    • https://static.s123-cdn-static.com/uploads/4386594/normal_5ff26b800353a.pdf
    • https://cdn.sqhk.co/gitogozune/hjijeii/parlour_x_sale.pdf
    • https://cdn.sqhk.co/suwapipejob/c4Vgdie/18161852301.pdf
    • https://nebemono.weebly.com/uploads/1/3/4/3/134331812/xipuw-fopanugik-judejogis-gozetaziniwon.pdf
    • https://jilukixewe.weebly.com/uploads/1/3/4/0/134042659/8822143.pdf
    • https://cdn-cms.f-static.net/uploads/4449789/normal_601a040b8ae87.pdf
    • https://cdn.sqhk.co/nokulebepoba/heVhejc/trivia_crack_questions_and_answers_2018.pdf
    • https://cdn.sqhk.co/dutaxato/jjG5vgc/roku_stock_forecast_cnn.pdf
    • https://cdn.sqhk.co/buganisazobu/agi3ier/rummikub_rules_joker_colour.pdf
    • https://cdn.sqhk.co/feguzuvubut/gdjijhr/79457527666.pdf
    • https://cdn.sqhk.co/feketukadoz/jchwzHb/xudevapurulirug.pdf
    • https://gibegijatu.weebly.com/uploads/1/3/5/4/135400332/6619349.pdf
    • https://jewukezi.weebly.com/uploads/1/3/0/9/130970006/fasanitezirarodot.pdf
    • https://lezafopiga.weebly.com/uploads/1/3/4/6/134628758/f5760.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/tulosa/libukinowut.pdf
    • https://s3.amazonaws.com/lusabifef/32844920968.pdf
    • https://s3.amazonaws.com/kakekojezutok/residential_tenancy_agreement_addendum_form_bc.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e065.bin
fc6a234d293101f6913e5c0602a6c6abf1f55ba8904ff1fbb01515bca07905a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE065 5308 bytes
font_01_sfnt_off0000f278.bin
0e6702f871f63c8d99a9cf2093d1fe9d60e436976372bd32c4981bc0805c0057		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF278 10596 bytes
font_02_sfnt_off000116b0.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116B0 4324 bytes

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