Malicious PDF — malware analysis report

Static analysis result for SHA-256 625d2c1cb2705e19…

MALICIOUS

PDF

41.9 KB Created: 2020-05-22 16:04:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6e64d687846e4241872087edc497c2cd SHA-1: 867d7efc6ca127eb928b0821e3fd980e65270f82 SHA-256: 625d2c1cb2705e191c6949dcc929530993b6502bcfe10299936c31e90be3a03e
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The PDF document contains a large number of external links to other PDF files hosted on various domains. This behavior is indicative of a link farm or a distribution mechanism for further malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://74-123-79-206.mgwnet.com/uploads/1/3/0/4/130478566/130478566.html#hymne+des+fraternis%25C3%25A9s+en+fran%25C3%25A7ais
    • http://_mta-sts.halowenamioty.pl/uploads/1/3/1/4/131411199/zibekibakorob-vufibuwid-topunilatisu-zifano.pdf
    • http://goedkopehoveniers.com/uploads/1/3/0/4/130489149/2358408.pdf
    • http://goedhartagency.com/uploads/1/3/0/6/130604645/2f330e3fe0fd58.pdf
    • http://borderlinesproject.com/uploads/1/3/0/5/130588989/lorutabupelore.pdf
    • http://strategicvirtue.com/uploads/1/3/0/8/130814976/vabivepatewedul_renarivif_tejovaroj_nujegevenoxeve.pdf
    • http://specializedfit.com/uploads/1/3/0/5/130590608/josaso_dederododek.pdf
    • http://openclosetshops.com/uploads/1/3/0/7/130776025/7087268.pdf
    • http://greenovationswnc.com/uploads/1/3/1/8/131856207/pijidefumeso.pdf
    • http://f-2-k.org/uploads/1/3/0/6/130620343/3640694.pdf
    • http://grief-is.com/uploads/1/3/0/6/130620326/toniveniri_dijojitu_beduzepan.pdf
    • http://everysecondmotivation.com/uploads/1/3/0/4/130483953/7015246.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007217.bin
4303c1dfb563039455e0863b9cd094072db02ab616de0374c566c1d797e48210		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7217 12868 bytes

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