Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ed2206dd3b199b3…

MALICIOUS

PDF

37.3 KB Created: 2020-03-17 17:40:04 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e9ed6838ee7d9ea7f8faabfc29318a03 SHA-1: 36acba0aa3a665f85c89cea03318d8c26bb1ce0c SHA-256: 3ed2206dd3b199b3c8eef4f89a90aba04f8aa04f9b09d4bb0c4a1c661017988f
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files with numeric slugs, indicating a link farm or SEO poisoning tactic. The document body, though heavily obfuscated, contains a URL that appears to be a lure for educational content. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted from this sample.

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://tartelaine.com/uploads/1/3/0/9/130969515/130969515.html#how+to+draw+lewis+structure+for+xef4
    • http://rootlocal.net/uploads/1/3/0/5/130538831/7713085.pdf
    • http://uiescape.voyagerwebsites.com/uploads/1/3/0/8/130814711/libifid.pdf
    • http://qui.social/uploads/1/3/0/4/130477110/tofojobovusobubu.pdf
    • http://www.mjbjacobs.com/uploads/1/3/0/4/130476144/9133557.pdf
    • http://whaleyoga.com/uploads/1/3/0/7/130775923/faravinevepi.pdf
    • http://arapahoepainting.com/uploads/1/3/0/4/130476262/kagane.pdf
    • http://1300998887.com/uploads/1/3/0/4/130490915/xavexokewaketovabi.pdf
    • http://swintuitiveart.com/uploads/1/3/0/3/130313316/8364643.pdf
    • http://www.muddyfeetfarm.org/uploads/1/3/0/6/130605435/voxik.pdf
    • http://www.thrivetobehealthy.com/uploads/1/3/0/2/130289166/a121e0c9cfbdf2.pdf
    • http://audreymonae.com/uploads/1/3/0/2/130289392/1479707.pdf
    • http://hairreplacementwilmington.com/uploads/1/3/0/4/130435786/1153699.pdf
    • http://tripsupplies.shop/uploads/1/3/0/6/130621422/xodarak_xagurezenezel_rekag_jonavene.pdf
    • http://acnightmarket.com/uploads/1/3/0/8/130874247/2487994.pdf
    • http://kateycrews.org/uploads/1/3/0/2/130274349/nigolixes.pdf
    • http://www.opus48choir.com/uploads/1/3/0/6/130620449/bezej.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_off00006940.bin
31d2be0ae2fb9982fb05d62c17d5dcb6018d837c102721db857c29692b858e78		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6940 7904 bytes

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