Malicious PDF — malware analysis report

Static analysis result for SHA-256 fef403c0317fb41f…

MALICIOUS

PDF

37.8 KB Created: 2020-06-04 20:49:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e94adfea931e226537dee987287a4cce SHA-1: 14a6fe221738e7927567993d169bc252f5a6f626 SHA-256: fef403c0317fb41fda92cd0e261a891c8d6ed437252eb0dac91a9eddfc1fae92
96 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 malformed, contains references to URLs that are part of this link farm. The primary intent appears to be directing users to a network of websites, likely for SEO spam or to host further malicious content.

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://lastsolo.com/uploads/1/3/0/6/130640214/130640214.html#brooks+brothers+men%2527s+suits+fit+guide
    • http://esidconsulting.com/uploads/1/3/1/3/131381982/wobeto.pdf
    • http://fundamentalsocceracademy.com/uploads/1/3/0/6/130639177/2703999.pdf
    • http://hotmc-alts.com/uploads/1/3/0/6/130620986/zonetizukukib_ragesetorug.pdf
    • http://housebythelakephuket.com/uploads/1/3/1/4/131438353/pofujupexo-dalak-bemufagasalak-gawobalolufeso.pdf
    • http://ukasiaproperty.com/uploads/1/3/0/5/130590583/laputagezasi.pdf
    • http://oxcamphire.com/uploads/1/3/0/5/130540197/tefeluzow_gemudanuje_gebesiterajiguj_buvelafudunif.pdf
    • http://veconcreting.com/uploads/1/3/1/4/131437107/78679.pdf
    • http://collegeangelservices.com/uploads/1/3/0/5/130589147/dewaruruwuvidufut.pdf
    • http://irishknucklesmma.com/uploads/1/3/1/6/131606624/funif.pdf
    • http://rachelameng.com/uploads/1/3/1/3/131384735/tuduvaxukukug-zenatab-sadafifufafew.pdf
    • http://gammonsgames.com/uploads/1/3/0/6/130621995/rumamaxalebisokuvova.pdf
    • http://lastsolo.com/uploads/1/3/0/6/130640214/terms.html
    • http://lastsolo.com/uploads/1/3/0/6/130640214/dmca.html
    • http://lastsolo.com/uploads/1/3/0/6/130640214/policy.html
    • https://tuwepuzo.files.wordpress.com/2020/06/1414454179.pdf
    • https://wobuzitij.files.wordpress.com/2020/06/palipotanadakivarida.pdf
    • https://zadidepetox.files.wordpress.com/2020/06/73035912989.pdf
    • https://kataxufekor.files.wordpress.com/2020/06/tugidivonigev.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_off00006808.bin
8201b6c71fbc924aca454a576e9b9b6bfec0f515c3c4f6243eebeca28a97394e
pdf-font-stream PDF embedded font (sfnt) at offset 0x6808 10260 bytes