Malicious PDF — malware analysis report

Static analysis result for SHA-256 42b3c0cb37ec7826…

MALICIOUS

PDF

39.1 KB Created: 2020-03-24 08:06:53 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0ce1803a664e7a0b5d6b3eefc0008ea6 SHA-1: 1247abacbfe679f8820a17638d41cf694b8e465b SHA-256: 42b3c0cb37ec78267412be1df3d1b73ed29c64aabfcb2a36c8e6b9b3126b62d8
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, includes the phrase 'Cambiar formato de publisher a pdf', suggesting a lure. The primary intent appears to be directing users to a network of websites, likely for SEO spam or to host further malicious content. 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://reboundat.com/uploads/1/3/0/6/130621524/130621524.html#cambiar+formato+de+publisher+a+pdf
    • http://womenofclay.com/uploads/1/3/0/3/130313495/pasiwumupelivi.pdf
    • http://ns1.helenfeild.com/uploads/1/3/0/7/130775965/zidetajedowox.pdf
    • http://www.wanted-jeans.com/uploads/1/3/0/5/130589099/853016.pdf
    • http://www.madelinerebeccadesign.com/uploads/1/3/0/8/130813658/7834960.pdf
    • http://glitterbyskysupply.com/uploads/1/3/0/4/130435583/e4d24af6cdcc8.pdf
    • http://wegatherround.org/uploads/1/3/0/4/130476970/2237111.pdf
    • http://adorncastlerock.com/uploads/1/3/0/7/130739693/4b6be197e6a4a.pdf
    • http://www.atajmil.com/uploads/1/3/0/5/130540366/xewubivovuba-bivilibuxoz-zezunutebitidek.pdf
    • http://emilystiehl.com/uploads/1/3/0/7/130740477/timubejujuboxu.pdf
    • http://darellesigpoodles.com/uploads/1/3/1/1/131164124/6028126.pdf
    • http://www.spellermetcalfe-christmas.co.uk/uploads/1/3/0/6/130605016/wujowufedawov_vebafetiwetato.pdf
    • http://dyartistry.org/uploads/1/3/0/9/130969346/boteladitag_wekejubitefu.pdf
    • http://standoutindallas.com/uploads/1/3/0/2/130272963/xediwilotebira_mifofa_vizagabosa_wuwuso.pdf
    • http://balancebowentherapy.com/uploads/1/3/0/3/130379612/7834457.pdf
    • http://lfpurpleluvpromotions.com/uploads/1/3/0/7/130776082/2351591.pdf
    • http://narberthchurch.com/uploads/1/3/0/5/130589217/zemazavapazexulewod.pdf
    • http://foodhealthharmony.com/uploads/1/3/0/2/130270898/ramizilamaxolimose.pdf
    • http://kruakhunein.com/uploads/1/3/0/7/130738597/weworelipad_lefalorexubuwew_vavisowenag.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_off00006e4d.bin
9d6101fa7eecf625a18c95587093ab7ed8c459d98efa4209aa6732c76ba566cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E4D 8476 bytes

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