Malicious PDF — malware analysis report

Static analysis result for SHA-256 01e314a83a110aef…

MALICIOUS

PDF

52.2 KB Created: 2020-03-31 01:31:08 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1f446a0bd2273745824626c22f82bc36 SHA-1: a1238d9352c9965516dde12df5def8fd4b90fad5 SHA-256: 01e314a83a110aef173302a1dd85c481f0b937f74cfa56f89a47cd212687e59e
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a large number of embedded external links, many of which point to other PDF files, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly indicated maliciousness, and the PDF structure with numerous external links is a common technique for distributing malicious content or driving traffic. No scripts were extracted, but the sheer volume of outbound links is highly suspicious.

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://gregjiel.com/uploads/1/3/1/3/131382740/131382740.html#federal+civil+procedure+bar+exam+outline
    • http://tococapitalventures.com/uploads/1/3/0/9/130969241/2306130.pdf
    • http://cristawadsworth.com/uploads/1/3/0/6/130640220/d24c87ad.pdf
    • http://stayweirdstitches.com/uploads/1/3/0/7/130738752/3d6d1c8d5.pdf
    • http://connexionadr.com/uploads/1/3/0/7/130775742/5427116.pdf
    • http://sisulife.shop/uploads/1/3/0/2/130288592/zalofoguj.pdf
    • http://feliceproperties.com/uploads/1/3/0/5/130546209/bulanigos.pdf
    • http://auburnincubator.com/uploads/1/3/0/6/130621214/zogivatarovif-dibalitidofedot.pdf
    • http://mikescheydgolf.com/uploads/1/3/1/0/131070571/8518349.pdf
    • http://americanlegioncleveland.org/uploads/1/3/0/4/130483981/bufegus.pdf
    • http://xtremelma.com/uploads/1/3/0/7/130776228/womodonu_fimivulorasana.pdf
    • http://wildbandofmystics.com/uploads/1/3/0/6/130605078/kalitowotero.pdf
    • http://saulmendozaphoto.com/uploads/1/3/0/6/130620782/66a4beb54a8d5a.pdf
    • http://skarnagers.dk/uploads/1/3/0/4/130483153/8017f5da5d5.pdf
    • http://carsecurebox.fr/uploads/1/3/1/4/131483112/riviverewexigigo.pdf
    • http://curvybrideri.com/uploads/1/3/0/3/130323384/72187.pdf
    • http://emmajamesboutique.shop/uploads/1/3/0/7/130776639/topebezitasej_bujevowu_padituj_saxitu.pdf
    • http://www.satisfiedwithlife.com/uploads/1/3/0/5/130539319/2347707.pdf
    • http://thelocshub.com/uploads/1/3/1/3/131380592/9246169.pdf
    • http://cartcootiecovers.com/uploads/1/3/0/9/130969429/5432501.pdf
    • http://estatecarolina.com/uploads/1/3/0/2/130291328/larivupo_wuwawosuwo.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_off0000a234.bin
9b60a232a58a3967c062df4d9c16b0da15a100c067f2a63ac314b5df95300345		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA234 8412 bytes

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