Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a104d27ac262f16…

MALICIOUS

PDF

73.1 KB Created: 2021-03-25 09:52:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce27d02b1c59b3fe0e09ac8febaa2be0 SHA-1: b2e1811c203114f50be542ad34134947f50056f8 SHA-256: 6a104d27ac262f1639710768c86d4fac8ae4a48f21904a633d5c8d0ac0f2ae09
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDFs, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs are the primary indicators of compromise, facilitating the download of further malicious content.

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://zajinet.ru/award?keyword=callan+method+stage+2+pdf+free+download
    • https://pilonalamajavex.weebly.com/uploads/1/3/1/1/131164122/b5acad.pdf
    • https://cdn.sqhk.co/gapebeve/vlfjfjb/sumenevarejataxew.pdf
    • https://cdn.sqhk.co/nawamuzimosu/aR76igj/fixalubivowisituxilam.pdf
    • https://koxawikala.weebly.com/uploads/1/3/4/6/134643159/e3dc7c4dce8ac9.pdf
    • https://pijaremurepapo.weebly.com/uploads/1/3/1/4/131406688/gefala.pdf
    • https://cdn.sqhk.co/vibebexez/Whfgiib/9089968741.pdf
    • http://you-bestshop.xyz/sogojapadawewizezuridaxcx9u2.pdf
    • http://appletopshop.ru/68465707599vsman.pdf
    • https://cdn.sqhk.co/wefopijupe/Qhbig1i/gurifabipaxisov.pdf
    • https://cdn.sqhk.co/fipufose/BYVYgca/tejujutatogumoboluxo.pdf
    • https://jupavovol.weebly.com/uploads/1/3/4/3/134314217/edef9.pdf
    • https://rurasaza.weebly.com/uploads/1/3/4/8/134869927/mifopu-kurosojotukol-mojajarunoru-bonolazulobob.pdf
    • https://zaxewunatomilar.weebly.com/uploads/1/3/4/1/134131499/povogigalewevaf-tijixubafozas-xivikage.pdf
    • https://nafejodibema.weebly.com/uploads/1/3/4/3/134318188/a8e70eb029.pdf
    • http://superheatbelt.xyz/free_movie_making_software_for_mac_os_xxml2j.pdf
    • https://mabamigetope.weebly.com/uploads/1/3/4/4/134493328/lovuxumelola.pdf
    • https://zavegaligap.weebly.com/uploads/1/3/4/4/134499553/6690472.pdf
    • https://zezazuzomej.weebly.com/uploads/1/3/1/0/131070861/8c1f6d9a1269.pdf
    • https://cdn.sqhk.co/mowamukar/haQ41hc/11542163116.pdf
    • https://mufogijagojar.weebly.com/uploads/1/3/1/0/131070489/2118572.pdf
    • https://cdn.sqhk.co/nunemiziku/jhehjhe/xefiwazawopef.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000d9e2.bin
e5dd3fbc084de1c401ea6ebe00d731a1055826d77ddab62769c24d710ef5cd95		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E2 5584 bytes
font_01_sfnt_off0000ecc8.bin
d8ddcbf989004b8868a6dce33f97f101c1dfab55b16daaf728d331a6fb37f447		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECC8 12520 bytes

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