Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f0f5e51d46effb8…

MALICIOUS

PDF

36.2 KB Created: 2020-06-17 23:55:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a69d6f846f58648f669f2859ff67168 SHA-1: 14e105ca1eff1ea8a21b94af6342827032805e19 SHA-256: 3f0f5e51d46effb8e2c3ba61632a53f523f98750ceb1a94b2ea52240f842c0b5
94 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, a technique often used in SEO poisoning or link farm attacks to drive traffic to malicious sites. The document body, though partially corrupted, includes text suggesting a 'business statistics pdf download' lure, aligning with the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The primary IOCs are the external URLs embedded within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://pm-marketing.eu/uploads/1/3/0/6/130621058/130621058.html#ken+black+business+statistics+pdf+download
    • http://godskyearth.org/uploads/1/3/1/8/131860479/7308802.pdf
    • http://klh20.salon225.com/uploads/1/3/0/8/130873983/a397d4c33.pdf
    • http://decisionagronomics.com/uploads/1/3/0/8/130813982/lutotifegolup.pdf
    • http://southatlanticbridgingco.com/uploads/1/3/1/3/131380342/pisud.pdf
    • http://swofilmschool.com/uploads/1/3/0/4/130477007/fimiboduni.pdf
    • http://jerrynewton.net/uploads/1/3/1/4/131437508/bovemakudaziju_dabusogawivur_viguwaba_diwominoliluzik.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005102.bin
ffecf3a723d9895fae751f03dfc648f218ecdb7e6943d64418d063769af60886		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5102 5200 bytes
font_01_sfnt_off000062cb.bin
ad76d9a71b9f17c4b83799e1110d3033442e178f3be9711bc6e49b8c5234bdb8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62CB 9996 bytes

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