Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f27bb4ed0fc937b…

MALICIOUS

PDF

46.4 KB Created: 2020-03-23 10:32:06 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0a1feb4e91cc910ed510d6cab610eff3 SHA-1: d9874c5756be70bd36433f032c1f24a5f3ae2c2e SHA-256: 8f27bb4ed0fc937b6869d4b34720802d6390cafb8bdec3c2ac64bf259a20d72f
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The document body text, though partially corrupted, contains the phrase 'Como convertir litros a metros cubicos' and references 'wkhtmltopdf', suggesting a lure document. The primary intent appears to be directing users to a network of linked websites, likely for SEO spam 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://cemfd.ca/uploads/1/3/0/2/130270917/130270917.html#como+convertir+litros+a+metros+cubicos
    • http://darwinlazatinphotography.com/uploads/1/3/0/2/130271004/sorofasun.pdf
    • http://ilovethepain.com/uploads/1/3/0/4/130490056/kexoja.pdf
    • http://culturallyresponsivesustainedteaching.com/uploads/1/3/0/7/130776167/6841539.pdf
    • http://getbetterbaseball.com/uploads/1/3/1/1/131164023/7554432.pdf
    • http://www.prontogarageparts.com/uploads/1/3/0/5/130588581/5986633.pdf
    • http://seomontrealexpert.com/uploads/1/3/0/4/130435956/4254057.pdf
    • http://lionheartinvestments.org/uploads/1/3/0/6/130604716/bfc618.pdf
    • http://producebros.com/uploads/1/3/0/8/130874478/8603479.pdf
    • http://bassbrothersllc.com/uploads/1/3/0/9/130969923/43e594edb7b40f.pdf
    • http://glendalepress.com/uploads/1/3/1/1/131164132/683667.pdf
    • http://normaniarellano.com/uploads/1/3/0/5/130544009/a253c2fdd7d.pdf
    • http://nakomagraeagle.com/uploads/1/3/0/7/130776393/xusema-zenasojipovol-redalezewizak-nobabigo.pdf
    • http://environmentalservicesco.com/uploads/1/3/0/3/130313388/kigaro.pdf
    • http://nwlaxshack.com/uploads/1/3/0/6/130604488/c4885529ce86a44.pdf
    • http://7email.net/uploads/1/3/0/7/130776577/5690605.pdf
    • http://www.fulcrumaero.com/uploads/1/3/0/7/130738870/3864579.pdf
    • http://wehrtvets.org/uploads/1/3/0/4/130488851/7adb272215.pdf
    • http://stillwaterswellness.org/uploads/1/3/0/6/130621163/aed0e116f.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_off000076e9.bin
e392260e8c6c3001e314a0b623d42047727d0010cc507bd508b5003cc4e7c24d
pdf-font-stream PDF embedded font (sfnt) at offset 0x76E9 8248 bytes
font_01_sfnt_off00009559.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63
pdf-font-stream PDF embedded font (sfnt) at offset 0x9559 16036 bytes