Malicious PDF — malware analysis report

Static analysis result for SHA-256 68743b8a5e4c01ad…

MALICIOUS

PDF

38.8 KB Created: 2020-03-31 04:05:01 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: fedd81befe8045153290aa5a5de67518 SHA-1: 8f69e8b7f1b0a68d3670f29f327f4c1cfffa1aae SHA-256: 68743b8a5e4c01ad6b45aff231b4b225af0cf0988c2508ee70fc07f1c38806a3
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or a distribution mechanism for malicious content. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to potentially harmful content, possibly as part of a phishing or SEO-based attack.

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://qreflections.net/uploads/1/3/0/2/130289799/130289799.html#concepto+elementos+y+clasificacion+de+los+estados+financieros+pdf
    • http://pfennigproperties.com/uploads/1/3/0/5/130543276/161f71f050645d.pdf
    • http://gatheringthefamily.com/uploads/1/3/0/5/130541765/9033770.pdf
    • http://kbs.implementation.collectivehealth.com/uploads/1/3/0/6/130620813/guteruxulofaxema.pdf
    • http://openairsoultions.com/uploads/1/3/0/6/130620484/dejod.pdf
    • http://rosbal.ca/uploads/1/3/1/3/131383434/6507912.pdf
    • http://fightingthefight.org/uploads/1/3/0/5/130545382/690513.pdf
    • http://seniors-who-care.com/uploads/1/3/0/6/130620195/5612186.pdf
    • http://kontention.com/uploads/1/3/0/6/130621896/derime.pdf
    • http://crafe-away.com/uploads/1/3/0/5/130588997/fizowasa.pdf
    • http://lifemattersyoumatter.com/uploads/1/3/1/1/131164485/6935574.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_off00006cb7.bin
50303d38b9fcb6cf18fd2866be3a27c0f79ee7c2d04e9fae971bba6d2e2ca9aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CB7 8624 bytes

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