Malicious PDF — malware analysis report

Static analysis result for SHA-256 6643685e7a506f69…

MALICIOUS

PDF

34.4 KB Created: 2020-04-20 12:46:08 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 6b62a0ca04a4026db33aab8dfce5463a SHA-1: 120acff0efe633b6755492aea31ed4358ad0a612 SHA-256: 6643685e7a506f696ff69f968872b9c2a194084225826d56ecb3a024036df346
96 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. It contains a large number of external links, many of which point to uniquely named PDF files on various domains, suggesting a link farm or SEO manipulation tactic. The document body contains garbled text and some of the extracted URLs, indicating a potential attempt to disguise malicious activity. No scripts were extracted, but the sheer volume of external links is highly suspicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://javierderma.com/uploads/1/3/0/4/130477036/130477036.html#transformers+optimus+prime+studio+series+32
    • http://andrewsaluti.com/uploads/1/3/0/2/130291552/kikilotikelibeni.pdf
    • http://test-caterina-nailandstyle.com/uploads/1/3/0/7/130739237/gixumom.pdf
    • http://ajtopcleaning.com/uploads/1/3/0/9/130969218/58101094404d.pdf
    • http://mattjenningsband.com/uploads/1/3/0/6/130621444/9029440.pdf
    • http://haywardtrackandfieldcoaching.com/uploads/1/3/1/3/131383604/458db.pdf
    • http://nibbleincbakingco.com/uploads/1/3/1/4/131407324/7ccf1458e0603c.pdf
    • http://everything-4us.com/uploads/1/3/0/6/130639600/4514572.pdf
    • http://aguirrefoundationrepair.com/uploads/1/3/0/5/130541950/poramoladedugerawu.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/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004d51.bin
cd3f9dfbb0d123c60ff6be0cd91d8724f6cb4646874326ba4455762408eaa4f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D51 7064 bytes
font_01_sfnt_off00006950.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6950 16036 bytes

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