Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1a98248bd938269…

MALICIOUS

PDF

35.1 KB Created: 2020-03-30 13:54:14 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c5945743e7fbdc9f935630c140be2b74 SHA-1: 3f6e06e3e319564819fceefc920e760dfb4144e1 SHA-256: c1a98248bd938269c97270527f87d6ff1c7128ad80426a34f68821dfac4d950b
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, contains references to URLs that are part of this link farm. The primary attack pattern appears to be a link farm designed to direct users to numerous external PDF files, potentially for SEO poisoning or to distribute further malware.

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://ankezimmermann.ca/uploads/1/3/0/7/130738996/130738996.html#revista+vaquero+pdf
    • http://thornhillscientific.com/uploads/1/3/0/6/130621026/zakiv.pdf
    • http://imkevandillen.nl/uploads/1/3/0/7/130776110/397b70316ee4.pdf
    • http://dehge.org/uploads/1/3/0/5/130588225/1cf79b58b22a.pdf
    • http://southcentralmarketinc.com/uploads/1/3/1/0/131071066/4aa4e7caf6e6b.pdf
    • http://asecretgarden.us/uploads/1/3/0/2/130270768/343e1e4a1.pdf
    • http://hccrooted.com/uploads/1/3/0/6/130621218/1083862.pdf
    • http://geekygiftbaskets.com/uploads/1/3/0/2/130272548/70746690f834dd.pdf
    • http://pursesnatched.com/uploads/1/3/0/3/130379314/3691213.pdf
    • http://livesimplyanonymous.com/uploads/1/3/1/3/131380754/9e1604e4803a.pdf
    • http://corabliss.com/uploads/1/3/1/4/131406253/tafowubipovozipolip.pdf
    • http://whm.pflaghouston.org/uploads/1/3/0/4/130436050/saxupagiriwane.pdf
    • http://masteringjack.com/uploads/1/3/0/5/130589240/nenanulo.pdf
    • http://301businesscenter.com/uploads/1/3/0/4/130483207/lonos-fivesolosu-dafep-bubuzos.pdf
    • http://knapontwerp.com/uploads/1/3/0/3/130323984/ruzawiwotu.pdf
    • http://collincurry.com/uploads/1/3/0/8/130814591/d8744f79256.pdf
    • http://gardentriunity.com/uploads/1/3/0/6/130620491/xowozipozi_joxure_xotavujebedi_xikozaku.pdf
    • http://wmaustralia.com/uploads/1/3/0/6/130621020/506254.pdf
    • http://sgcinsight.com/uploads/1/3/0/8/130813851/momunelixetowozebov.pdf
    • http://travelmiwithme.com/uploads/1/3/0/6/130621283/aea70829b34f.pdf
    • http://anthologycollection.com/uploads/1/3/0/6/130603715/6138278.pdf
    • http://thegoddesssupply.com/uploads/1/3/1/3/131398123/2757014.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_off000060fb.bin
759640a0bf6ae8f31a874edf6872177ef99d320966ca53753a5aef52da218cb3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60FB 8288 bytes

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