Malicious PDF — malware analysis report

Static analysis result for SHA-256 02d00c4092388271…

MALICIOUS

PDF

40.8 KB Created: 2020-03-22 09:56:44 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: b4566aec89a7357590541208154c9a71 SHA-1: 7b4ef8027bfaa63d4139f357f468b3048c0d64d4 SHA-256: 02d00c40923882715084e57557a34c849b7381716a170bc441da5c99c9538e48
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 to other PDF files hosted across various domains. This behavior is indicative of a link farm or a method to distribute malicious content indirectly. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. No scripts were extracted, but the sheer volume of external links suggests a coordinated effort to direct users to potentially harmful content.

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://mrstruitt.com/uploads/1/3/0/6/130639068/130639068.html#how+to+thread+a+sewing+machine+singer+simple
    • http://propel.us/uploads/1/3/0/7/130775076/bfb89746a06465.pdf
    • http://sacredbody.co/uploads/1/3/0/6/130639500/mugozaza_pijesobuk_xodalajolarapu.pdf
    • http://chanjupark.com/uploads/1/3/0/6/130639537/sazuguzemodi.pdf
    • http://hostmaster.thesponsort.com/uploads/1/3/0/7/130739907/juniwexiti.pdf
    • http://www.jssoapworks.com/uploads/1/3/0/2/130289479/subukuvo.pdf
    • http://www.lazaroulab.com/uploads/1/3/0/7/130775274/dufita.pdf
    • http://www.warfareinhistory.com/uploads/1/3/0/3/130323266/gisowuvapuded-gusimawenax.pdf
    • http://mail.hawgridin.com/uploads/1/3/0/8/130873902/fevip-letiwawavusubo-tolelazipinurut.pdf
    • http://u2.technology/uploads/1/3/0/6/130621812/tetalawokalaluleboja.pdf
    • http://tfinstitute.com/uploads/1/3/0/7/130776493/gabaxuw.pdf
    • http://textilespreserved.com/uploads/1/3/0/8/130814642/fanopironilezipesigi.pdf
    • http://www.melissabroersma.com/uploads/1/3/0/2/130287307/mesejo.pdf
    • http://affordablepawns.com/uploads/1/3/0/2/130272417/pedobetubajiva.pdf
    • http://martyking.net/uploads/1/3/0/7/130738956/85622461c532.pdf
    • http://socalseas.com/uploads/1/3/0/6/130604627/28335f9ac043.pdf
    • http://www.chasefreedomunlimitedbonus.com/uploads/1/3/0/3/130323612/virevifobezukumefut.pdf
    • http://thebankofguns.com/uploads/1/3/0/2/130270994/0a554b1b.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_off000076cc.bin
093477ab437e454eed58987194cb1b14c289d584373c78192b940314eef224e0
pdf-font-stream PDF embedded font (sfnt) at offset 0x76CC 7992 bytes