Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ef4ca68e8d39826…

MALICIOUS

PDF

70.7 KB Created: 2021-04-01 03:06:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 0553e40fc2db968e096e25c68ceeb6c6 SHA-1: 201cdc4d850d91e96efa0612e5ad2d4b6595709e SHA-256: 7ef4ca68e8d3982612d344b422fc70a65ffd565a971b9750f4a183f85b284ff4
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate an attempt to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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.
  • 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://maypoin.ru/123?utm_term=hierarchicaldatatemplate+wpf+datagrid PDF link annotation
    • https://cdn.sqhk.co/pigexebobe/eiahajj/foxarakevopofasenener.pdfIn PDF document text
    • https://cdn.sqhk.co/jedugifaxido/hgiei0e/baby_yoda_name_mandalorian.pdfIn PDF document text
    • https://rifuxegu.weebly.com/uploads/1/3/4/5/134525143/rejiritixu.pdfIn PDF document text
    • https://ninuwekij.weebly.com/uploads/1/3/4/6/134625354/mawokilosuk.pdfIn PDF document text
    • https://saletenabij.weebly.com/uploads/1/3/4/3/134339554/792244.pdfIn PDF document text
    • https://cdn.sqhk.co/jowapezo/eG9hi5D/16081184103.pdfIn PDF document text
    • https://mesakarune.weebly.com/uploads/1/3/1/3/131380767/01bdfef35a.pdfIn PDF document text
    • https://kubuvapag.weebly.com/uploads/1/3/0/7/130776206/b804ac0585c5e07.pdfIn PDF document text
    • https://cdn.sqhk.co/fulaxanew/j6iagdX/vexetinuvenakakutuwibobez.pdfIn PDF document text
    • https://renibopasuviwi.weebly.com/uploads/1/3/4/3/134305424/xomegapopiva.pdfIn PDF document text
    • https://risenezapaf.weebly.com/uploads/1/3/4/4/134481661/09a89c16c9cf5.pdfIn PDF document text
    • https://vovazukaliwo.weebly.com/uploads/1/3/5/9/135962855/bovesesu_solejozifo_togugelab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405654/normal_60176b753021c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368975/normal_601aea0940b9a.pdfIn PDF document text
    • https://lerizizevu.weebly.com/uploads/1/3/4/3/134314130/zezapotenanotod-gonubus-ruleranen.pdfIn PDF document text
    • https://cdn.sqhk.co/labifikup/iigjbWa/small_orange_balls_on_palm_trees.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://601bead5-a720-4f65-98db-62fe2a42cb91.filesusr.com/ugd/0e52b4_fc8c8778eb5843429c9f7e26e0baf8ca.pdf?index=trueIn PDF document text
    • https://6c036dbd-b327-4678-b778-de8a2ee7bb50.filesusr.com/ugd/ed64d2_7822cece5c6845f48f583d37e16f4771.pdf?index=trueIn PDF document text
    • https://436010f1-0dd7-4950-aec0-3bdf337573e8.filesusr.com/ugd/5a4c69_61d951f5cde343adab3477082c2ec3af.pdf?index=trueIn 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_off0000d7dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DD 5444 bytes
SHA-256: 7c9de875bcd9f18bbb616620878dfb2778dccb865429596cb9ca52f35fb824df
font_01_sfnt_off0000ea45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA45 10268 bytes
SHA-256: 118727586679cf71cf351badd86cc4f4458fede5bdcf107226d4a8ffe4feeb31

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