Malicious PDF — malware analysis report

Static analysis result for SHA-256 3923956ebf629cf1…

MALICIOUS

PDF

41.9 KB Created: 2020-03-16 20:47:41 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: db5c4637ec2854d4b2472a1f89177688 SHA-1: 0ce3db2736e79c07bfc8d7a58fef23e830a773f7 SHA-256: 3923956ebf629cf12b2dacea3c2d0c5ce71cea07b1485c8ad373577e4d4667fc
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of external links, many pointing to other PDFs, indicative of a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the presence of numerous suspicious URLs suggests the document is designed to redirect 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://christinabeautyparlour.com/uploads/1/3/0/9/130969561/130969561.html#adjetivos+nombres+y+adverbios+en+ingles
    • http://strawwwberries.com/uploads/1/3/0/8/130813504/felase.pdf
    • http://mvillstyles.com/uploads/1/3/0/3/130379611/1665835.pdf
    • http://morongovalley.org/uploads/1/3/0/7/130739674/tizanetexibufimopora.pdf
    • http://www.kevingtonpress.com/uploads/1/3/0/2/130270845/lovajobajat.pdf
    • http://supernovaexotics.com/uploads/1/3/0/7/130775936/092a898.pdf
    • http://penseldrag.com/uploads/1/3/0/5/130550826/4263683.pdf
    • http://jujelalzle.site/uploads/1/3/0/3/130323705/651a229d3.pdf
    • http://phorion.com/uploads/1/3/0/5/130590682/8687513.pdf
    • http://mytayloralexander.com/uploads/1/3/0/7/130739129/wagirabigubef.pdf
    • http://aufstehen-gegen-linksfaschismus.org/uploads/1/3/0/4/130435939/69e2ce4.pdf
    • http://waconda.com/uploads/1/3/0/3/130323250/2203008.pdf
    • http://mediterraniaorientalrugs.com/uploads/1/3/0/4/130435834/d8744.pdf
    • http://e4mafiacoffeecompany.com/uploads/1/3/0/2/130289782/6278902.pdf
    • http://mta-sts.mx.jillisahope.com/uploads/1/3/0/5/130551135/5e0c0b95e2e57f7.pdf
    • http://monpresident.net/uploads/1/3/0/2/130289305/9c10cb5f4dae.pdf
    • http://www.sinkishop.store/uploads/1/3/0/4/130476351/2715706.pdf
    • http://bejustalittlebetter.com/uploads/1/3/0/8/130814457/mebuzixeno.pdf
    • http://younggunsyouthfitness.com/uploads/1/3/0/6/130621592/917174.pdf
    • http://junbinow.com/uploads/1/3/0/4/130477003/polazij-doribo.pdf
    • http://phorion.com/uploads/1/3/0/5/130590682/868
    • 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_off00007843.bin
469eed50723ea4e3b1987683c6b252cb75b682eb493a11c631dbff6f1264ec47		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7843 9048 bytes

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