Malicious PDF — malware analysis report

Static analysis result for SHA-256 1544a0647659af25…

MALICIOUS

PDF

34.0 KB Created: 2020-05-15 01:12:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 772c1c6e5aa98556faf23064219f9c82 SHA-1: 7bce87a4c7674fdbaada77bdd150a18daac5c40a SHA-256: 1544a0647659af25ec2d99154a823e881ae912764a6be57c97e2514143a62b7d
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. The primary URL points to a page with 'mitosis and meiosis ppt questions answers', suggesting a lure to educational content. The ML classifier strongly indicates maliciousness, and the sheer volume of outbound links suggests a coordinated effort to distribute content or manipulate search results, potentially leading to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://thesoonernetwork.com/uploads/1/3/0/8/130874585/130874585.html#mitosis+and+meiosis+ppt+questions+answers
    • http://sing4you.org/uploads/1/3/0/6/130603704/nixugunisigumow.pdf
    • http://csgsllc.com/uploads/1/3/1/3/131379409/59edf579.pdf
    • http://knackforlife.com/uploads/1/3/0/3/130323293/1a3c0e3bce83.pdf
    • http://harnesshorses.org/uploads/1/3/0/5/130550752/3421787.pdf
    • http://rionheart.com/uploads/1/3/0/6/130639662/lajiloraval.pdf
    • http://imaginelab.co/uploads/1/3/1/4/131437848/vikajovorigafegikife.pdf
    • http://allbrighttechnologies.com/uploads/1/3/0/2/130289224/1146801.pdf
    • http://sweetcrafts.org/uploads/1/3/1/3/131398020/xenazaxosuji.pdf
    • http://2chickschatabouteggs.com/uploads/1/3/0/7/130739396/fccfbc68.pdf
    • http://alisondeutsch.info/uploads/1/3/0/3/130379248/vodukuduxigab.pdf
    • http://sirbonifurnishings.com/uploads/1/3/0/9/130969865/divonurajilasirigu.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_off00005b6a.bin
42cef28f7e6e6e53dd28893e435012211f69fb827e609db90e019845e6de9920		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B6A 9884 bytes

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