Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce80530a08c435c8…

MALICIOUS

PDF

82.5 KB Created: 2021-02-13 19:44:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3023eb8a15c6222fb5119048b3577dca SHA-1: d730e04dfedef6d85fc7b9ad11e214ceecd2d956 SHA-256: ce80530a08c435c8f02bed8aaf6cd3fe0d454564992fd514a99cac306073d4ef
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, and is flagged by ML classifiers and ClamAV as malicious. The embedded URLs suggest an attempt to redirect users to potentially malicious content or phishing sites. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

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://bologen.ru/aws?utm_term=liquid+template+filters
    • http://anyita.space/34261963673g9xch.pdf
    • https://zuzesewijolane.weebly.com/uploads/1/3/1/4/131406438/gixekulipena_tofazoxagem.pdf
    • https://cdn.sqhk.co/pipujevi/ha3OYYu/97849651538.pdf
    • https://lelusujizuzu.weebly.com/uploads/1/3/1/4/131438438/11835339e.pdf
    • https://fefodenajefive.weebly.com/uploads/1/3/1/4/131437461/baviduvaxijuw-zusazebunewo-feranejigi-xebuwopoki.pdf
    • http://nasporte1.fun/953979821866u74r.pdf
    • https://sisuwupuwadigif.weebly.com/uploads/1/3/1/4/131437471/filalig.pdf
    • http://help-nanny.site/messenger_windows_70ahw6.pdf
    • http://itwow.info/webeledepisodekejegekomonnu3mg.pdf
    • https://tepadomuxufebe.weebly.com/uploads/1/3/1/3/131382092/326806.pdf
    • https://vizifota.weebly.com/uploads/1/3/0/9/130969876/zaforijudorawi-bakezupedus-mefadav.pdf
    • https://katopogovalasa.weebly.com/uploads/1/3/5/4/135401177/8332310.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nelizenejakarug/logo_quiz_answers_level_10_iphone.pdf
    • https://s3.amazonaws.com/xajowu/43189622585.pdf
    • https://s3.amazonaws.com/sifawekujiki/xuxuwemibiwomimava.pdf
    • https://s3.amazonaws.com/vexeliku/82196141963.pdf
    • https://s3.amazonaws.com/tonemakopinibem/36284012075.pdf
    • https://s3.amazonaws.com/pobixedele/enfermedades_de_los_organelos_celulares.pdf
    • https://s3.amazonaws.com/suximawo/debupop.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_off000106e1.bin
d010a0fd1dd4e8ec101ca7f79f535f590de206be40db5e21816e3cb412882201
pdf-font-stream PDF embedded font (sfnt) at offset 0x106E1 5252 bytes
font_01_sfnt_off000118ae.bin
86aadd37b3bb2ce03de122b35bfff9e2cd8d82e593e0af76df5605175eacdb47
pdf-font-stream PDF embedded font (sfnt) at offset 0x118AE 10536 bytes