Malicious PDF — malware analysis report

Static analysis result for SHA-256 b521c6852b54d887…

MALICIOUS

PDF

45.2 KB Created: 2020-03-21 01:41:44 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f4346f2842e077462fe02496a2ef620a SHA-1: c0b08b6d9598e3e316deb55d44a64bfb9b2ad1f2 SHA-256: b521c6852b54d88748919c3bb2051f692bef552abfd3807dbe5e8ed85c29fa07
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF file contains a large number of external links, many of which are dynamically generated and point to other PDF files. The document body, though partially corrupted, suggests an educational theme for children, which is likely a lure. The primary purpose appears to be directing users to a network of linked websites, potentially for SEO manipulation or to host further malicious 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://marghefoodstories.com/uploads/1/3/0/5/130589435/130589435.html#ejercicios+de+unidades+y+decenas+para+ni%C3%B1os+de+primer+grado+de+primaria
    • http://flowerssensationsbyeyleen.com/uploads/1/3/0/6/130604104/figede_dejelupo_jumijafolofuvug_losidoxawuza.pdf
    • http://mlkgrandjunction.com/uploads/1/3/0/8/130813458/3063537.pdf
    • http://onecrescent.us/uploads/1/3/0/8/130814421/xebejunoge.pdf
    • http://www.forterestorationandconstruction.com/uploads/1/3/0/5/130588380/64c05c6.pdf
    • http://www.discovervirtualagencyllc.org/uploads/1/3/0/5/130588342/nixuxanuwepip-zusugeg-gafewupuvulal-valireji.pdf
    • http://www.alebalieiro.cl/uploads/1/3/0/5/130539329/1988344.pdf
    • http://joeforcali.com/uploads/1/3/0/4/130435688/bukotofi.pdf
    • http://www.tkrlawmn.com/uploads/1/3/0/9/130969923/wubej_pelixijez.pdf
    • http://commemorativechoir.com/uploads/1/3/0/5/130551670/xumukevumemax.pdf
    • http://yttconsultant.com/uploads/1/3/0/6/130621944/kelad.pdf
    • http://abraxastattoo.com/uploads/1/3/0/6/130639258/zibejudiketok-gejosibewujine-xavivi-vejekakukogebe.pdf
    • http://lindakaren.net/uploads/1/3/0/6/130639214/9836.pdf
    • http://www.rosarinxscontraelfmi.org/uploads/1/3/0/6/130639164/6111097.pdf
    • http://www.prairieskygirlscouts.org/uploads/1/3/0/3/130313132/magiwakabobazi-muvir-wiwovajizax.pdf
    • http://motorcyclespeakers.org/uploads/1/3/0/6/130620852/pepaf-lawowasaxinol-tuvikib-zaresutiweduko.pdf
    • http://www.onnona.com/uploads/1/3/0/6/130639849/789059.pdf
    • http://abstracts-by-kc.com/uploads/1/3/0/3/130379078/eeaba2df2f.pdf
    • http://taylomack.com/uploads/1/3/0/5/130551639/xefalosafovo.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_off00006d76.bin
d5ea1fdd9325babdebb88a96ead15ccaaadcd88ceab2c86ca3ee9f1b478a690a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D76 9076 bytes
font_01_sfnt_off00008e32.bin
99c5a563bd14079918bfffdbdfd95054cabbef0c47e0e3eb61f716c3cd559389		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E32 16124 bytes

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