Malicious PDF — malware analysis report

Static analysis result for SHA-256 90507f7896dfc1d7…

MALICIOUS

PDF

39.0 KB Created: 2020-03-29 11:31:15 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0c5beb574e947caa69e93ead56867958 SHA-1: 2c43d1ebfa736cea16d41343f54de05f93486d81 SHA-256: 90507f7896dfc1d79f2d0ac92f8e591059bdb75d2c88768dda96be957bf5052c
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF contains a large number of external links, many of which point to other PDF files on different domains. This pattern is indicative of a link farm or a distribution mechanism for malicious content. The ML classifier strongly supports the malicious verdict. No scripts were extracted, and the document body is heavily obfuscated, but the presence of numerous external links is the primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://74-123-73-226.mgwnet.com/uploads/1/3/0/2/130270843/130270843.html#examen+de+ortografia+para+primaria+pdf
    • http://lgv.photo/uploads/1/3/0/6/130621405/7a9733d16.pdf
    • http://hostmaster.bristolplanthire.com/uploads/1/3/1/3/131384136/duxom_zudupotibula_bibisunuviwu.pdf
    • http://providafitness.com/uploads/1/3/0/5/130589288/dozifad-fasoburoz.pdf
    • http://brighterbranding.net/uploads/1/3/0/5/130551343/xamubunof.pdf
    • http://newwaveproperties.net/uploads/1/3/0/7/130776536/9741025.pdf
    • http://babagoosh.com/uploads/1/3/0/4/130492315/fexifusetiwe.pdf
    • http://rygajournal.com/uploads/1/3/0/8/130814216/bigodipe_famuwovuzej_gamumamerade_kewopopi.pdf
    • http://barachan.store/uploads/1/3/0/5/130551072/fetijakakuz.pdf
    • http://asrbatberkeley.com/uploads/1/3/0/4/130483230/4368300.pdf
    • http://me210team25win19.com/uploads/1/3/0/4/130476098/708f00680.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/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b40.bin
03afb9a2351ba5435abbb1d9bbb8364b24f641b642c7d9bc7e454d7a9c094467		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B40 9740 bytes

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