Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c0f067db1439211…

MALICIOUS

PDF

40.4 KB Created: 2020-03-21 18:48:51 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2c2b67c5ac13eb8fa9900b7aa8b8f05d SHA-1: 1e45c173000694dab7fa02572380f60b5f204fc3 SHA-256: 1c0f067db1439211f0763162d5ff8a8822aa215084f7893ad07eff4efbfcdd85
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, as indicated by the PDF_SEO_LINK_FARM heuristic. The document body, though heavily obfuscated, also contains URLs. These links point to various domains, suggesting a link farm or a distribution network. The ML classifier also strongly indicated maliciousness. 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://qualitycareafh.com/uploads/1/3/0/9/130969984/130969984.html#concepto+de+filosofia+de+la+educacion+segun+autores+pdf
    • http://arbofor.fi/uploads/1/3/0/6/130621464/78e3e87e.pdf
    • http://mail.homesbycoppercanyon.com/uploads/1/3/0/5/130547078/vunefovule-niwuw-tufovikuwuma-ralipusekatuwam.pdf
    • http://www.civillifer.com/uploads/1/3/0/6/130603809/8750102.pdf
    • http://fatwoodexpress.com/uploads/1/3/0/5/130547552/nutizebutoletan.pdf
    • http://moobesity.com/uploads/1/3/0/4/130483499/migadevaxevutedisas.pdf
    • http://trilliumdayspaonjohnsriver.com/uploads/1/3/0/7/130738890/lupapupegupodod_revise_taxon_kamizuletaf.pdf
    • http://www.puppybuilder.com/uploads/1/3/0/3/130323251/xowigizu-jimukinomubil-wesowusukap.pdf
    • http://406cavoodle.com/uploads/1/3/0/3/130313378/jolalezavu.pdf
    • http://mta-sts.emx.sdlangshaw.com/uploads/1/3/0/8/130813416/64cd0.pdf
    • http://lllbc.club/uploads/1/3/0/8/130813536/wujokaka.pdf
    • http://dewynns.com/uploads/1/3/0/7/130775782/06f218e7146.pdf
    • http://firmhousestudios.com/uploads/1/3/0/7/130776394/8484057.pdf
    • http://www.happyhousebuyer.co.uk/uploads/1/3/0/7/130775982/8497348.pdf
    • http://vliegendestoel.nl/uploads/1/3/0/2/130272488/77c47090a233c.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_off00006b7e.bin
b095009e1aa7b679086a2dd093949a1e2bfdfa179c83d9e64a20210f199a406d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B7E 1544 bytes
font_01_sfnt_off000072ee.bin
1b9b4c1af388a77f9b5d51cc1d56e9edd3b2cc08f76a81c0faed6188eda8bb57		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72EE 8392 bytes

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