Malicious PDF — malware analysis report

Static analysis result for SHA-256 913cce8699fa22da…

MALICIOUS

PDF

86.2 KB Created: 2021-06-12 15:48:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d1c9debd47200b04d60baf2d309af18 SHA-1: 3ce58d3d21f547d6b317c429127fab1495d4458b SHA-256: 913cce8699fa22da3587e41b5d74ffb8e6498c5257b348603f30a0b0ee39ec6a
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files hosted on link farm sites, indicating a phishing or SEO spam campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to download a second-stage payload via one of the embedded URLs. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://huntic.ru/pbw?utm_term=go+math+7th+grade+answer+key
    • https://vudaxevagi.weebly.com/uploads/1/3/4/2/134234865/xotunigebumexarifud.pdf
    • https://mefivezetu.weebly.com/uploads/1/3/2/6/132681021/luwumapedemapuwotev.pdf
    • https://cdn-cms.f-static.net/uploads/4424683/normal_6057ea11e86bf.pdf
    • https://cdn-cms.f-static.net/uploads/4377931/normal_6030cbe607280.pdf
    • https://cdn-cms.f-static.net/uploads/4411491/normal_60419eea4bd0e.pdf
    • https://cdn-cms.f-static.net/uploads/4373985/normal_60c2aa56d3a36.pdf
    • https://donokodupotev.weebly.com/uploads/1/3/4/3/134317189/xunag_kumoruve_kakabuwasumo.pdf
    • https://rijujofa.weebly.com/uploads/1/3/4/3/134323569/6493a20621f.pdf
    • https://lagubezawepafu.weebly.com/uploads/1/3/1/8/131856446/1362478.pdf
    • https://metumarexidema.weebly.com/uploads/1/3/4/5/134591821/3976799.pdf
    • https://runidodejifam.weebly.com/uploads/1/3/4/0/134040950/4234082.pdf
    • https://cdn-cms.f-static.net/uploads/4418985/normal_603959855590a.pdf
    • https://xupuxubemuri.weebly.com/uploads/1/3/4/8/134872551/1898755.pdf
    • https://static.s123-cdn-static.com/uploads/4452372/normal_5ff8fc63cc636.pdf
    • https://cdn-cms.f-static.net/uploads/4377407/normal_6015bd8da8ce2.pdf
    • https://gixebufenof.weebly.com/uploads/1/3/6/0/136082423/aba834dc3214.pdf
    • https://gokalobinure.weebly.com/uploads/1/3/4/8/134861303/1c43c.pdf
    • https://wininivawad.weebly.com/uploads/1/3/1/4/131483201/b8bda.pdf
    • https://dewixazupeteti.weebly.com/uploads/1/3/1/4/131455636/nogiwizezenanamutot.pdf
    • https://static.s123-cdn-static.com/uploads/4378843/normal_5fdd0c9e4a4df.pdf
    • https://zufitamel.weebly.com/uploads/1/3/5/3/135349526/wibureferisi.pdf
    • https://cdn-cms.f-static.net/uploads/4422643/normal_60b8d0adc74af.pdf
    • https://tobiwetizipuwon.weebly.com/uploads/1/3/5/3/135341648/rorekinivo_rusinojadudof_reketolamejirad.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/cb72d113-91a8-4123-bcbc-01ddc5572fcc/veter.pdf
    • https://uploads.strikinglycdn.com/files/2a2a1288-fd94-47c8-b276-12d9ac6cf4d2/betoji.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_off0001105e.bin
6907b963e260186bd371edd302eb401029509099c15cc2830ed5373edc57c71f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1105E 5576 bytes
font_01_sfnt_off00012345.bin
45492bb73d7306c0392c1d77a13b3b4f8b7bb8c87ddad98d9996c6dbeac1ccbe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12345 11948 bytes

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