Malicious PDF — malware analysis report

Static analysis result for SHA-256 278edf1b7ed841b6…

MALICIOUS

PDF

31.0 KB Created: 2020-03-20 03:20:55 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: db86235ed6c9c8f15343507597b5fca4 SHA-1: b7afd146a3a138af3196547cf9e11fe27e9b6796 SHA-256: 278edf1b7ed841b60dcc1890538450d214bf2b4d01c0f80428002d24a0c1ae6e
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files hosted on different domains. The ML classifier also strongly indicated maliciousness. This suggests a link farm or SEO poisoning attack, where the goal is to drive traffic to these external resources, potentially for distributing malware or phishing content. No scripts were extracted from this sample.

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://calsupplier.net/uploads/1/3/0/8/130813888/130813888.html#sistema+educativo+nacional+sep+pdf
    • http://harrison-ley.com/uploads/1/3/0/8/130813668/fegisobi.pdf
    • http://stuartsladeforestschool.eu/uploads/1/3/0/4/130483200/1a8f5.pdf
    • http://htesolutions.co.uk/uploads/1/3/0/4/130435781/kimat-resuboz.pdf
    • http://levelupcoachingandconsulting.com/uploads/1/3/0/6/130621025/2526532.pdf
    • http://worldclasssurfbreaks.com/uploads/1/3/0/5/130589108/b0d467c.pdf
    • http://mollybooth.com/uploads/1/3/0/5/130550841/barisalitegu-sovat-kenufinaxupon-lugugixan.pdf
    • http://hostmaster.bemyguest.lt/uploads/1/3/0/6/130639327/xakakizudega-dojiwewapox-mevegonejaxed-kewejonivoga.pdf
    • http://theessentialoilsmethod.com/uploads/1/3/0/6/130603851/ae6bfb03.pdf
    • http://hubsinhalf.com/uploads/1/3/0/5/130551585/wexis.pdf
    • http://pelletgrillcentral.com/uploads/1/3/0/9/130969854/7c44d3.pdf
    • http://pickledpretty.com/uploads/1/3/0/6/130639611/c9469c7ae.pdf
    • http://spotsbay.com/uploads/1/3/0/7/130775800/47a48309e46.pdf
    • http://melaniegarunay.com/uploads/1/3/0/5/130550756/3975199.pdf
    • http://decamundo.com/uploads/1/3/0/7/130740196/5539449.pdf
    • http://www.twirlduo.com/uploads/1/3/0/2/130289229/xuxigutitigew.pdf
    • http://www.suzannebrowninteriors.com/uploads/1/3/0/4/130477048/kudagexa.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_off00005449.bin
7732cee8883a6e249b2cb57481884f15e51bc890385437341768a9fbaa54cdd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5449 6620 bytes

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