Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5ac4b864e88a84a…

MALICIOUS

PDF

43.8 KB Created: 2020-03-26 11:48:41 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d222ba6b06aaf30861a8fcc4d6b6d56f SHA-1: 88487dd6312a7490b50727e1955477fe1e33e987 SHA-256: f5ac4b864e88a84ad470ef66543706e7c910fea92e35177c49453a720a32ea1e
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, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, contains references to these URLs, suggesting a coordinated effort to redirect users to potentially malicious content or for SEO spam.

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://undeadcameras.com/uploads/1/3/0/4/130476348/130476348.html#angulos+del+triangulo+isosceles
    • http://magicalcryptofriends.org/uploads/1/3/0/4/130435561/zegizi_ruvisumusaveted_betewakuzi.pdf
    • http://www.erinsauer.com/uploads/1/3/0/8/130813866/a690c.pdf
    • http://www.resteaz.com/uploads/1/3/0/6/130621153/kexef.pdf
    • http://1tailgate.com/uploads/1/3/0/2/130289409/2c47201.pdf
    • http://usdaum.global/uploads/1/3/0/5/130550995/6476182.pdf
    • http://fancibaking.com/uploads/1/3/0/7/130738830/3757242.pdf
    • http://niamhmoore.net/uploads/1/3/0/4/130483385/779a4.pdf
    • http://campingdeberghoeve.com/uploads/1/3/0/6/130620272/gewujuzipeluf.pdf
    • http://randallwakefield.com/uploads/1/3/0/2/130289380/jaleza-kowosujikitas.pdf
    • http://bosstreatsforher.com/uploads/1/3/0/9/130969663/riperukun_negaloj.pdf
    • http://mhsbooster.bluewireweb.com/uploads/1/3/0/2/130287960/734379.pdf
    • http://accesscampdc.com/uploads/1/3/0/4/130488273/4e2fe5ad281edb.pdf
    • http://goodmorninghomes.ca/uploads/1/3/0/5/130540928/3257368.pdf
    • http://jinuj.com/uploads/1/3/0/2/130289271/3664048.pdf
    • http://developertony.com/uploads/1/3/0/6/130620283/luxasuzotuzivin.pdf
    • http://myfitathome.com/uploads/1/3/0/7/130776749/naluduke.pdf
    • http://wastewaterexpert.net/uploads/1/3/0/8/130813714/kupetafefadinut.pdf
    • http://annjarvie.com/uploads/1/3/0/6/130639456/8117312.pdf
    • http://www.professionalsconsortium.com/uploads/1/3/0/9/130969037/2898805.pdf
    • http://bricknjhealthinsurance.com/uploads/1/3/0/7/130775920/51f76.pdf
    • http://webmail.directional-ambition.com/uploads/1/3/0/2/130291694/nujopelorijixe-reliziguj-fuzite-gusojotamele.pdf
    • http://beaniesshoerepair.com/uploads/1/3/0/4/130435956/fazesifolik.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_off000073b8.bin
9d804ef65851efa1e97358c4d1dea3ac915020cc87d92bc42a836b88b7b8014a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73B8 9256 bytes
font_01_sfnt_off00009507.bin
0fff8637fe4384a78c319bbc38c9924ea46f85d2542dee181d8687891991a99e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9507 2944 bytes

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