Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4991a4182c46819…

MALICIOUS

PDF

49.3 KB Created: 2020-04-21 08:16:37 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: 2ed21e61f56b8396cc860a1543fe0375 SHA-1: 4c0940642c2152c4e0c2043844d00dd920cc5b7e SHA-256: f4991a4182c46819bb606c17ed82bb13ab7a7142c1fb2a0cbf37ffe712607b70
96 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The document body, though partially corrupted, includes text related to 'impossible quiz' and references to the authoring application, suggesting a lure. The primary function appears to be directing users to a vast network of websites, likely for SEO spam or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://corporate-communication-solutions.com/uploads/1/3/1/4/131453595/131453595.html#answer+to+the+impossible+quiz+number+38 PDF link annotation
    • http://allaboutyoucateringanddesigns.com/uploads/1/3/0/8/130873838/d19bb9.pdfIn PDF document text
    • http://cutevsevil.com/uploads/1/3/0/7/130775050/227d5450ee7dc1.pdfIn PDF document text
    • http://climateisotopes.net/uploads/1/3/0/7/130739935/tafeloxebuwes_nudorujiw_kapivefakadig_gujiwiwideze.pdfIn PDF document text
    • http://adultedshare.com/uploads/1/3/0/2/130289377/jeworamojiboguzutoj.pdfIn PDF document text
    • http://vffc.vn/uploads/1/3/1/3/131383825/6745930.pdfIn PDF document text
    • http://kasmimi.com/uploads/1/3/1/4/131436983/5861109.pdfIn PDF document text
    • http://asurionces.com/uploads/1/3/0/5/130550738/mopajep.pdfIn PDF document text
    • http://lscplacer.com/uploads/1/3/0/9/130969960/2146176.pdfIn PDF document text
    • http://afterflowacademy.com/uploads/1/3/0/4/130490410/gaborafilimepe-soxomominopep-sotovovuwiku-nuwasewigavuteg.pdfIn PDF document text
    • http://ambitionco.shop/uploads/1/3/1/4/131408344/zovamewalumomefupu.pdfIn PDF document text
    • http://jrjohnsonlnc.com/uploads/1/3/0/6/130640179/1765046.pdfIn PDF document text
    • http://simplytalie.com/uploads/1/3/0/6/130604406/vaxedizuzasixexevowi.pdfIn PDF document text
    • http://millercustomconstruction.net/uploads/1/3/0/8/130873996/fodusolejisin.pdfIn PDF document text
    • http://emporiumofsweets.net/uploads/1/3/0/5/130551387/9306064.pdfIn PDF document text
    • http://answersIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008db1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DB1 9060 bytes
SHA-256: b9f2bf6394bb8a0665778dd749d94043cdb3f8c8c9b151197b2b0a45abdfbc4c
font_01_sfnt_off0000b06e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB06E 1708 bytes
SHA-256: 83459e82cebe561b9e65dda6a09953c9e35f75e5df0fa62a624e1833cc5b8086

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