Malicious PDF — malware analysis report

Static analysis result for SHA-256 e76f8b96ebc8985b…

MALICIOUS

PDF

41.9 KB Created: 2020-04-12 16:09:50 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0fca07411ed2920268ee2a50c2e633f2 SHA-1: d51051b59b575d2820c414b08f137cff918cf7ec SHA-256: e76f8b96ebc8985b3b08ac143e64516d48574ad49a73ede0e3f9316f6f1428d3
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of external links, many of which point to other PDF files, indicating a link farm or SEO abuse tactic. The ML classifier strongly flagged this PDF as malicious. The document body, though partially corrupted, contains a URL that mirrors the topic of teaching vowels to children, suggesting a lure to a potentially malicious website.

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://visualizarmasarquitectura.com/uploads/1/3/0/8/130813755/130813755.html#como+ense%C3%B1ar+las+vocales+a+un+ni%C3%B1o+de+3+a%C3%B1os
    • http://sgbenefits.net/uploads/1/3/0/6/130639676/407343.pdf
    • http://akupressur-therapie.ch/uploads/1/3/0/4/130488417/vazil_vajilewino_baguwupaz.pdf
    • http://dwellstore.in/uploads/1/3/1/4/131438582/wamagufapefa-fiwat-pukew-nafufenug.pdf
    • http://spirittouch.info/uploads/1/3/0/6/130621606/502459.pdf
    • http://mcnye18.com/uploads/1/3/0/4/130476129/bonegojatu.pdf
    • http://tomhumhaiphong.com/uploads/1/3/0/3/130323211/xinudoxotik_sujugejijo_sawowolixuk.pdf
    • http://reneeseducation.com/uploads/1/3/1/0/131071167/9beba.pdf
    • http://motifrenovations.com/uploads/1/3/1/4/131409526/ditawa.pdf
    • http://checkthe.net/uploads/1/3/0/5/130550912/nisavoru-loboxowekum.pdf
    • http://purememorial.com/uploads/1/3/0/4/130488365/suxekupelopixoge.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000063e7.bin
ba056494fde16a1dd6d2c457aaf9839662bac5e169dbff50a758442e0736a36c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63E7 9092 bytes
font_01_sfnt_off00008521.bin
6f5589cf1763d9b30124e401b8407e77d4f7b0da0f268c3843f690d2cc1178e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8521 16168 bytes

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