Malicious PDF — malware analysis report

Static analysis result for SHA-256 c809e4109f8796b7…

MALICIOUS

PDF

50.1 KB Created: 2020-03-30 07:06:55 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e28cfb27cb4af00bd3d528028cd235af SHA-1: 8ae765a7c48dd3e88bd876ee4fa073586e266f8d SHA-256: c809e4109f8796b7dd2f69135ad5dec472dfb6691c1eceef384a4726c7eae215
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to similarly structured URLs on different domains, indicating a link farm or SEO abuse tactic. The ML classifier strongly flagged this PDF as malicious. The document body text is largely unreadable due to encoding issues but contains a URL that is also present in the list of external links.

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://us.momotombochocolatefactory.com/uploads/1/3/0/7/130775744/130775744.html#oraciones+en+futuro+para+ni%C3%B1os+de+primaria
    • http://torontoductcleaner.com/uploads/1/3/0/5/130546937/voxudilidarudex.pdf
    • http://citizensarmory.net/uploads/1/3/0/4/130476539/8f9aa.pdf
    • http://caitlindettling.com/uploads/1/3/0/2/130272921/sabeged.pdf
    • http://chris4kzoo.com/uploads/1/3/0/5/130589342/65728a65d.pdf
    • http://azuolaszip.lt/uploads/1/3/0/3/130323302/webanalogatu-venalokalawu-biloj-fixujebekerudi.pdf
    • http://zaccheosgunsmith.com/uploads/1/3/1/0/131070089/4550636.pdf
    • http://providing4you.com/uploads/1/3/0/5/130590164/fewotuguwa.pdf
    • http://10thavenuerebuilders.com/uploads/1/3/0/6/130603764/xenagejedut.pdf
    • http://fancyshihtzus.com/uploads/1/3/0/8/130814042/penoxigamaja.pdf
    • http://bism8.com/uploads/1/3/0/2/130289535/652bcf295e1.pdf
    • http://diaexecutivecar.com/uploads/1/3/0/5/130539583/wukuvovofinexukikuvo.pdf
    • http://cheznouslanderneau.com/uploads/1/3/0/8/130874180/mopuliwoginezepowop.pdf
    • http://ehfenjoyhealthyfood.de/uploads/1/3/0/4/130491271/847e48.pdf
    • http://bodymedicannix.com/uploads/1/3/0/7/130739128/foligonit.pdf
    • http://jrwoodley.com/uploads/1/3/0/6/130621361/6643d45.pdf
    • http://kim2design.net/uploads/1/3/0/5/130551141/34a62bdb.pdf
    • http://dashccinc.com/uploads/1/3/1/4/131409616/regukub_gewonefidiset_nugokagigozajut_lotexemajusuro.pdf
    • http://mdcrichmond.com/uploads/1/3/0/2/130272260/47f2358.pdf
    • http://joyillustrated.com/uploads/1/3/0/4/130436122/463658.pdf
    • http://artlesshordeinc.net/uploads/1/3/1/1/131164054/3023184.pdf
    • http://bandyandshinty.com/uploads/1/3/0/3/130379676/4444344.pdf
    • http://kkclothing00.com/uploads/1/3/0/2/130270956/wegibud.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_off00008316.bin
4cb550e3ede21dc91f336516db27bb1ad0f1fc7b245c6fbeb4edefd77e9da4c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8316 8764 bytes
font_01_sfnt_off0000a310.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA310 16036 bytes

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