Malicious PDF — malware analysis report

Static analysis result for SHA-256 7af822d8bfcab479…

MALICIOUS

PDF

40.0 KB Created: 2020-04-20 13:47:59 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 64345e37a9926f3daba204ca78add5a4 SHA-1: f9fd2a1e94ba86d683aea2356e5af28bfe383408 SHA-256: 7af822d8bfcab479a6b8fed3e124919398f58b564614a96e938fcf46bcd69b24
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which are structured as a link farm, suggesting a malicious intent to redirect users. The ML classifier strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards a phishing or redirection attack, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://springyfeet.com/uploads/1/3/0/7/130740199/130740199.html#incident+response+plan+template+cis
    • http://instbarthexperiences.com/uploads/1/3/0/7/130775485/mimimejomujeb-fulawafitezira-momopurexete.pdf
    • http://angelisefsb.com/uploads/1/3/0/7/130775903/feruj_zelil_polugul_rezojatixemobe.pdf
    • http://camperhand.com/uploads/1/3/0/7/130776325/welolu-fiwumawumufog-jogidud-venugesexutobe.pdf
    • http://changelaw.org/uploads/1/3/0/8/130873738/6244025.pdf
    • http://cloudbrk.net/uploads/1/3/1/1/131164435/72a69bd99e4a2.pdf
    • http://life-in-full-empowerment.net/uploads/1/3/1/4/131437138/c1e4c20c7052c36.pdf
    • http://investbachmanncapital.com/uploads/1/3/1/4/131455232/f2ea9d134d840.pdf
    • http://msquaredesigns.in/uploads/1/3/1/4/131436972/sadodugadagobutexeko.pdf
    • http://olivebranchconsultancy.org/uploads/1/3/0/8/130874164/vafazomesev.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_off00007351.bin
c4a6f5a5afba61508b4b525ee9a1b48ead39eebe3bb294a262b8e07c8a7d2419		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7351 8108 bytes

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