Malicious PDF — malware analysis report

Static analysis result for SHA-256 32c4cf2feb55a71c…

MALICIOUS

PDF

32.9 KB Created: 2020-04-03 06:51:53 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d87999a95175eddca3d9fe087feaf797 SHA-1: 048f1d6f92b7e2055501d119f9ab162fb47ed154 SHA-256: 32c4cf2feb55a71ca37694835fc167d51b44345c3b21c97a1d2708b4a23faca2
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique often used for SEO poisoning or to redirect users to malicious content. The ML classifier strongly indicated maliciousness. The document body text and embedded URLs suggest a lure related to 'Exercices le plus que parfait pdf', likely intended to drive traffic to a link farm or phishing site.

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://bluestonewinery.com/uploads/1/3/1/4/131453573/131453573.html#exercices+le+plus+que+parfait+pdf
    • http://janwindle.com/uploads/1/3/0/8/130874681/kuvinewinojo_binedaropelavar_zijokukuge.pdf
    • http://vredenburgwoodworks.com/uploads/1/3/0/7/130738777/145183dcff9b.pdf
    • http://videoprofesionalcr.com/uploads/1/3/0/5/130588693/sixoleligato.pdf
    • http://jansuniqueboutique.net/uploads/1/3/0/4/130476039/varusek.pdf
    • http://grin-and-tonic.com/uploads/1/3/0/8/130874368/fupum.pdf
    • http://the-drive-to-thrive.com/uploads/1/3/0/2/130289628/6ea8e89da75.pdf
    • http://tmctalent.com/uploads/1/3/0/3/130379651/jemopaxomabit_pokobidibute.pdf
    • http://historicalporttalbot.com/uploads/1/3/1/0/131070051/jivimulupififosirilo.pdf
    • http://celisifiricel.com/uploads/1/3/1/4/131455475/38f2672e3b9.pdf
    • http://perpetualcycling.com/uploads/1/3/0/3/130323555/fazakasugimakan.pdf
    • http://spiritvalor.com/uploads/1/3/0/6/130621240/misidamo.pdf
    • http://sheaandaloe.com/uploads/1/3/0/2/130272388/sipime_gigekejo_noxinametawut.pdf
    • http://ecsmedicine.org/uploads/1/3/1/3/131380469/xavuvegonigu.pdf
    • http://equineperformanceservices.com/uploads/1/3/0/2/130273624/4152451.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_off0000584d.bin
f815c1ee7dfdfa7723818348b873b74c81d270ebe390d3874f3c5954ec78049c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x584D 7804 bytes

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