Malicious PDF — malware analysis report

Static analysis result for SHA-256 16e73f9f714c9035…

MALICIOUS

PDF

30.1 KB Created: 2020-06-15 23:03:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b3cca5faf91b3fa09085950a920603b4 SHA-1: e4d68007d064d2d4f59ed08348b337ed263fe94d SHA-256: 16e73f9f714c9035f28984cde815c9909328fdcbb48f02dd8a11b2eb87ea2de9
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file exhibits characteristics of a link farm or SEO spam, embedding numerous external links to other PDF documents. The document body, though partially obfuscated, suggests a lure related to an 'espresso machine manual'. The presence of many external links, combined with the ML classifier's high confidence, indicates a malicious intent likely related to distributing further malicious content or manipulating search engine results.

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://adsl-63-204-18-1.benefitplans.org/uploads/1/3/0/9/130969247/130969247.html#promac+espresso+machine+manual
    • http://kjmedia1.com/uploads/1/3/0/8/130873890/19709f21b7b.pdf
    • http://hillbillysolutions.com/uploads/1/3/1/3/131382217/porisokir.pdf
    • http://trusteddoctor.org/uploads/1/3/1/4/131406835/5274319.pdf
    • http://angelcomfort.net/uploads/1/3/1/4/131407711/68b62cee0cdf47.pdf
    • http://hostmaster.aforeignlocal.com/uploads/1/3/1/4/131438216/d479d4e77e.pdf
    • http://thesunsetswithoutyou.com/uploads/1/3/1/0/131070483/zemajom.pdf
    • http://74-123-72-187.mgwnet.com/uploads/1/3/0/4/130476628/filotume_mitev.pdf
    • http://fabiolasaglimbeni.com/uploads/1/3/0/7/130740533/wilenoxewujasakor.pdf
    • http://venturetize.com/uploads/1/3/1/1/131164016/9403623.pdf
    • http://midnight-bakes.com/uploads/1/3/0/3/130313783/1362955.pdf
    • http://clearthebusinessfear.com/uploads/1/3/1/8/131872149/854379.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_off00004d12.bin
4ec83ced1a141046e44e448dcbdf6f1617a761943a4156f35b84243f1b68f0a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D12 9504 bytes

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