Malicious PDF — malware analysis report

Static analysis result for SHA-256 acdbb232cef424fc…

MALICIOUS

PDF

70.7 KB Created: 2021-02-19 00:03:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 0786cb1ea2721524033e9c9e864de8c4 SHA-1: 2b0715c750736fc42cfac76b5901f2a62a096960 SHA-256: acdbb232cef424fc2c6165f71787c0d148f330763366a8049be1f1a04589bb68
156 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan. The embedded URLs suggest a tactic to redirect users to potentially harmful content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://druttle.ru/wix?keyword=online+smartboard+games+for+kindergarten PDF link annotation
    • https://dopapixe.weebly.com/uploads/1/3/1/3/131383645/sokugubakutujol.pdfIn PDF document text
    • https://fipufiradak.weebly.com/uploads/1/3/0/8/130813779/9310008.pdfIn PDF document text
    • https://ranogokosupevi.weebly.com/uploads/1/3/1/4/131454436/zejamezuwu.pdfIn PDF document text
    • http://magowowir.iblogger.org/panasonic_catalogue_2019.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417809/normal_5ffa19a2a6515.pdfIn PDF document text
    • https://javemutamutog.weebly.com/uploads/1/3/4/6/134638327/bepokawawibewam-bafesirozok.pdfIn PDF document text
    • https://pamaxorakumi.weebly.com/uploads/1/3/4/0/134019068/0fc31ebe8df8.pdfIn PDF document text
    • https://renugukid.weebly.com/uploads/1/3/0/9/130969315/a340c6010.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4528915/normal_5ff50dbd0e963.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468296/normal_602b94486d12b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://junixaz.epizy.com/56553451602.pdfIn PDF document text
    • https://s3.amazonaws.com/jezobasit/toxonekegulojanowazegul.pdfIn PDF document text
    • https://s3.amazonaws.com/kozibowisenatu/crash_bandicoot_video_game.pdfIn PDF document text
    • https://s3.amazonaws.com/xoguwavosuje/13403985075.pdfIn PDF document text
    • https://s3.amazonaws.com/vajefam/lovegag.pdfIn PDF document text
    • https://s3.amazonaws.com/vipuxafol/61172457966.pdfIn PDF document text
    • https://s3.amazonaws.com/wajufifenoxuj/igcse_chemistry_notes_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/posufij/febewerugoriluvilun.pdfIn PDF document text
    • https://s3.amazonaws.com/mejifavo/china_cymbal_sound_free.pdfIn PDF document text
    • https://s3.amazonaws.com/lebejos/kizulajaf.pdfIn 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_off0000d78b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78B 5460 bytes
SHA-256: d6368c9d481a0b0daa8b8f9da3beab67c2aa70df5fd339c4e4644f2bfd3809c9
font_01_sfnt_off0000e9fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FD 10452 bytes
SHA-256: 533f4ec340f1ba8de4a1583312aa3b26a572e618c125862dca1f76cb31dc833f

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