Malicious PDF — malware analysis report

Static analysis result for SHA-256 04660aa968500fb6…

MALICIOUS

PDF

31.5 KB Created: 2020-05-27 03:42:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4a12d17555037c4dda1c1c0dc51ff747 SHA-1: f2663dcff8445b17032e3f1db8d6569432d2e055 SHA-256: 04660aa968500fb603b87982db84cd713d336f16244cec4c2e1341e7a4686452
96 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are structured as SEO-friendly URLs pointing to other PDF files. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm. The embedded URLs likely serve as lures to download further malicious content or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://adsl-63-204-18-44.benefitplans.org/uploads/1/3/0/5/130551728/130551728.html#alexander+tamil+movie+video+songs+free
    • http://chloecustomcollections.com/uploads/1/3/1/8/131856877/sedogonavitegi.pdf
    • http://lighthouseorganizing.com/uploads/1/3/0/4/130435500/ditijawiwexanaj_golerotimu_sarasemo_tozotejenip.pdf
    • http://visitelecostarica.com/uploads/1/3/0/2/130291475/lifewidokusib_gigijupamem_luludom_zixitopesilinij.pdf
    • http://libertywin88.com/uploads/1/3/0/7/130739124/666886.pdf
    • http://applausehotel.org/uploads/1/3/0/4/130490476/150848dfd45.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004fd4.bin
9d1be1dd63e5eca38d7883abbb60df0adb19baf98d71b87414b33c051c3fdda6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4FD4 10456 bytes

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