Malicious PDF — malware analysis report

Static analysis result for SHA-256 baa8e490e13df38c…

MALICIOUS

PDF

74.1 KB Created: 2021-03-29 14:41:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 26a69c79cce0c8edda1b5a5621d458b9 SHA-1: d3245105e90729fdf9310054cdfc719676ce402c SHA-256: baa8e490e13df38c35d443260fbbe30dd50edcf593adb9d72ef233f687ceec63
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. One of the primary external URIs points to 'https://jumiwimov.ru/wix?keyword=drastic+apk+not+patched', suggesting a lure related to software downloads. ClamAV also detected this file as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0', reinforcing its malicious nature. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://jumiwimov.ru/wix?keyword=drastic+apk+not+patched
    • https://gokixojegesefa.weebly.com/uploads/1/3/4/8/134864476/jowazivosi.pdf
    • https://cdn-cms.f-static.net/uploads/4495251/normal_6015eb1949745.pdf
    • http://frontglass.xyz/gejirisosal0id0m.pdf
    • https://sujugixuguxidi.weebly.com/uploads/1/3/4/6/134615921/2091605.pdf
    • https://cdn-cms.f-static.net/uploads/4454803/normal_5fdc0014b46d7.pdf
    • https://pufukowog.weebly.com/uploads/1/3/4/5/134583281/tedud.pdf
    • http://creamspait.xyz/what_to_write_for_a_godchild_first_communioni9azv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/2c5dc3d9-0786-4cb0-84f6-e3e7e504b423/tifivozivoj.pdf
    • https://uploads.strikinglycdn.com/files/7c5ada8c-2567-4ca6-bee3-f0ae5cad0e31/kaxexom.pdf
    • https://s3.amazonaws.com/leributafa/crystal_report_viewer_properties_in_c.pdf
    • https://uploads.strikinglycdn.com/files/a78c0f08-9169-4325-a20b-00288cc401c6/how_to_carry_baby_in_baby_bjorn.pdf
    • https://s3.amazonaws.com/musoxifuvitalo/sajedozinotufope.pdf
    • https://s3.amazonaws.com/rotowan/69673441077.pdf
    • https://uploads.strikinglycdn.com/files/b10007eb-f5eb-4b91-b56d-dde980da7202/gozusif.pdf
    • https://uploads.strikinglycdn.com/files/a664ed3c-00f7-49a2-b59b-1cd029488fe5/47887858379.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2e7.bin
e448453efcc35767a0ade16d1b51ee1cb213f81286994c5406f5bfc2c57ec57e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E7 5192 bytes
font_01_sfnt_off0000f48e.bin
fa361f373aa66873f30a3eb3f63a2f85f4dec9e21741e24980d772477ec22c68
pdf-font-stream PDF embedded font (sfnt) at offset 0xF48E 11580 bytes