Malicious PDF — malware analysis report

Static analysis result for SHA-256 435a47b8f0863d98…

MALICIOUS

PDF

45.1 KB Created: 2020-03-24 13:14:31 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: cb81fe3beaf5e9f967afa5c7c4f9a579 SHA-1: f909ad38343936db8ed9b6253abce5362624b5c5 SHA-256: 435a47b8f0863d986efd86c241ed51e8e02a58f3c91739c6636e0a83c7f584b0
94 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF document contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. The embedded document body text, though partially obfuscated, includes a URL that points to a large collection of PDF files hosted on various domains. This suggests a link farm or SEO manipulation tactic, potentially used to distribute malicious content or improve search engine ranking for malicious sites. 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://insurewithhoward.com/uploads/1/3/0/6/130639404/130639404.html#classic+graphic+design+theory
    • http://baraspektrum.com/uploads/1/3/0/2/130270924/tisiranenedoban-kijatila-tawimape-pigazalura.pdf
    • http://streetwerkzcustoms.com/uploads/1/3/0/6/130604340/linejaxikew_torunovenamozuv_vixopis.pdf
    • http://youniquedecals.com/uploads/1/3/0/4/130483512/1eba90df75958.pdf
    • http://simonemgenna.com/uploads/1/3/0/6/130620399/3312032.pdf
    • http://74-123-76-71.mgwnet.com/uploads/1/3/0/3/130323774/laduloxufafa_nomixedupol_lufefadakoba_luxanot.pdf
    • http://selfhelpportal.com/uploads/1/3/0/2/130289682/e1f7b812c08c85a.pdf
    • http://nightingaleicecreamsandwiches.com/uploads/1/3/0/8/130873962/fofimisixuw.pdf
    • http://www.energy-se.com/uploads/1/3/0/8/130814232/9cd5eea333.pdf
    • http://uuvillagechurch.org/uploads/1/3/1/0/131069777/lusidozezen.pdf
    • http://bwellnhealthy.com/uploads/1/3/0/5/130550749/fasinadedep_tojidaxudotupa_pomapekapo_jetepiniz.pdf
    • http://www.storringtondfas.org/uploads/1/3/0/8/130814642/68de57a240c55f.pdf
    • http://bidstonavenue.com/uploads/1/3/0/2/130271206/wosegalagufigow-vimufuwamek-xipivisaxivet.pdf
    • http://ylc3.gobeyondthepond.com/uploads/1/3/0/4/130483215/temamurojexep.pdf
    • http://vm-co.com/uploads/1/3/0/6/130604244/eefe35.pdf
    • http://mx74.farmfreshsoaps.com/uploads/1/3/0/5/130589214/e4f0c67aa69.pdf
    • http://smalltubeparts.com/uploads/1/3/0/5/130539458/5859183.pdf
    • http://midwestsportingproperties.com/uploads/1/3/0/9/130970008/710292.pdf
    • http://flavoredsprinkle.com/uploads/1/3/0/2/130289386/9e379e957db8.pdf
    • http://distinktevents.com/uploads/1/3/0/6/130604977/zuxukumovav.pdf
    • http://admin.oxforddancecamp.info/uploads/1/3/0/8/130814252/8330468.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_off0000867e.bin
862b21a3eee2d22d3f3e83b54e83dd2beb6d0727b265ee9f1b1d34be270dab8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x867E 8476 bytes

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