Malicious PDF — malware analysis report

Static analysis result for SHA-256 83cd781bb91491a7…

MALICIOUS

PDF

31.2 KB Created: 2020-06-09 04:48:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a1f78e89690e3d4909901fef326849c9 SHA-1: 300c5aa9680838e7f90100da19bae10c2b95ce8d SHA-256: 83cd781bb91491a71424ab63f0f65baca9c870b74555f2958ad337d0fea1eca1
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to other PDF files on newly created domains. This behavior is indicative of a link farm or SEO manipulation tactic, potentially used to distribute malware or phish for credentials. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • 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 http://propulsioneers.net/uploads/1/3/0/7/130776208/130776208.html#palme+10.+s%25C4%25B1n%25C4%25B1f+kimya+soru+bankas%25C4%25B1
    • http://shieldsfinancial.com/uploads/1/3/1/4/131454394/turonuluzuxatosofep.pdf
    • http://kiew-medical.com/uploads/1/3/0/4/130435929/tofuxonugudidipofi.pdf
    • http://veganadominicana.com/uploads/1/3/0/6/130620345/webovub_xivirakuramo_goxexifowiwud.pdf
    • http://graceunlimited.com/uploads/1/3/0/7/130775027/valoxutepif.pdf
    • http://tourguidela.com/uploads/1/3/1/4/131482881/kozelurelujoso.pdf
    • http://74-123-77-93.mgwnet.com/uploads/1/3/1/1/131164185/5792b4b0474f.pdf
    • http://orgpc.com/uploads/1/3/1/8/131856402/xitibumekivod-gireru-guwabatofaxuji-suxirigovoz.pdf
    • http://lawofficeofterranceltoavspllc.com/uploads/1/3/0/3/130313241/kolumejur.pdf
    • http://mail.curiouscata.com/uploads/1/3/0/5/130588698/sokepozazozesuzexasu.pdf
    • http://australianfirstrealtycairns.com.au/uploads/1/3/0/6/130621357/ca8d214f8.pdf
    • http://jocilynsjourneytowellness.com/uploads/1/3/0/7/130739423/litamax.pdf
    • http://speelkoning.net/uploads/1/3/1/4/131453076/jopuje.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://toxovaje.files.wordpress.com/2020/06/pewimoxixuvabesov.pdf
    • https://ketativupu.files.wordpress.com/2020/06/43196478472.pdf
    • https://ruzugebemem.files.wordpress.com/2020/06/jonaxuvaw.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004bfa.bin
84bed5cccde0ee3a631dd1cd89245e87b67527b89e317315e6ba91b0c6a3326a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4BFA 11520 bytes

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