Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0db98d446b28546…

MALICIOUS

PDF

39.7 KB Created: 2020-03-29 02:19:21 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c4a081d4ccfb3bcee9d5ab3f8032051d SHA-1: 2cf7f9d7c091fc2720c95e18f768c692113cdc16 SHA-256: b0db98d446b285462a43edd2ea6772ad1db9396b570d35f8217c2d4c5813732a
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF contains numerous embedded URLs pointing to a large number of external PDF files hosted on various domains. The heuristic 'PDF_SEO_LINK_FARM' indicates this is a link farm, suggesting the primary purpose is to redirect traffic to these sites. The ML classifier strongly supports the malicious nature of this PDF. 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://www.user.padi-tour.com/uploads/1/3/1/3/131398101/131398101.html#fases+del+proceso+de+capacitacion+de+personal
    • http://progressionpropertiesllc.net/uploads/1/3/0/7/130740211/b19ac.pdf
    • http://olintell.com/uploads/1/3/0/8/130814687/dukowijezoguru_xutibefosu_fatewumabomax.pdf
    • http://lisagrahamlmhc.com/uploads/1/3/0/6/130639129/dudokijevona.pdf
    • http://accessdesigngroup.biz/uploads/1/3/0/3/130379228/jifenoneva.pdf
    • http://groomsoup.com/uploads/1/3/0/7/130775520/divuxegenep.pdf
    • http://mountainsidemt.com/uploads/1/3/1/0/131070314/9367c3b.pdf
    • http://w-sind.com/uploads/1/3/0/6/130605059/5659422.pdf
    • http://westcoastnpl.com/uploads/1/3/0/6/130605521/7154872.pdf
    • http://ncfg.life/uploads/1/3/0/5/130539881/6774805.pdf
    • http://texashempawards.com/uploads/1/3/0/2/130274199/wewazaleguvatanadi.pdf
    • http://catamaranadastra.com/uploads/1/3/0/6/130621625/2760133.pdf
    • http://grandmagoodlife.com/uploads/1/3/0/6/130639976/4318418.pdf
    • http://aca-contulsa2018.org/uploads/1/3/0/7/130739456/pameranurafafawose.pdf
    • http://lakarnevalistas.com/uploads/1/3/0/7/130739175/c97830595e.pdf
    • http://intelisched.com/uploads/1/3/0/6/130621378/goler_gasonofup_semegevomil.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_off000070b1.bin
0c763734a79a51cb5a483917ae3ee7b2c208b7fa7061cab70e91966f6966248e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70B1 8480 bytes

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