Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa6d5a8fe80c00c5…

MALICIOUS

PDF

42.5 KB Created: 2020-04-03 09:17:13 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e759b85d1b69b1f37ed8c0849d5f89f7 SHA-1: 3fef8c7e27e587087741c32378870eabae19a603 SHA-256: aa6d5a8fe80c00c56eef9efb4702710c927fa5960ee02e000fd7701e00fb3bc1
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a lure for a "French 1 free online course" and embeds a large number of external links, many of which point to other PDFs. This behavior is indicative of a link farm or SEO manipulation tactic, often used to distribute malicious content or drive traffic to phishing sites. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

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://oralkami.com/uploads/1/3/0/2/130272548/130272548.html#french+1+free+online+course
    • http://webbwilcoxen.com/uploads/1/3/0/6/130620354/275692.pdf
    • http://functionalartaholic.com/uploads/1/3/0/7/130776158/fiwumimebijugam-gebiwakejezigud.pdf
    • http://thorneandivy.com/uploads/1/3/0/2/130271116/viket.pdf
    • http://homeworkstrike.com/uploads/1/3/0/7/130776368/971439.pdf
    • http://stuccovenetiano.com/uploads/1/3/0/5/130540046/1090152.pdf
    • http://patrick-construction.com/uploads/1/3/0/4/130436239/kirevi-zuwujut.pdf
    • http://emeraldzen.com/uploads/1/3/0/8/130813497/669ba.pdf
    • http://kalitaflooringsource.com/uploads/1/3/0/6/130604018/gipeni_kedazuwot.pdf
    • http://sujitaomgoit.com/uploads/1/3/0/7/130739261/vagipiridut.pdf
    • http://elizabeth-black.com/uploads/1/3/0/5/130551144/5199493.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_off00007e4d.bin
e2d999f531ce42fa24cf4565239ec4e25c913dab7f5dcb1abb0062bd88dd4e84		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E4D 8136 bytes

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