Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a8aad7480b024c6…

MALICIOUS

PDF

65.6 KB Created: 2021-02-18 03:41:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: aa72defdcec74e82e594f90002e00ab8 SHA-1: d3bdda33f67167b42aaad88704e8c338580a41b4 SHA-256: 2a8aad7480b024c6e512666d2492338f63907cc05290096778e8dc2310a48fb2
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malware or phish users. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and a high ML classifier score further support its malicious nature. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'Qt', indicating its generation by a tool rather than direct user creation, and the primary URL suggests a lure for downloading content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jacksth.ru/aws?utm_term=throne+of+glass+download+vk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4372960/normal_602263d8705a7.pdfIn PDF document text
    • https://tipuvativojodud.weebly.com/uploads/1/3/4/7/134754547/8648604.pdfIn PDF document text
    • https://fowinojosusine.weebly.com/uploads/1/3/4/4/134495991/4039575.pdfIn PDF document text
    • https://pibiwija.weebly.com/uploads/1/3/4/8/134896476/donixi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417807/normal_60241c9bda890.pdfIn PDF document text
    • https://xexemisekugo.weebly.com/uploads/1/3/4/6/134679242/bezat-borus-matunibu.pdfIn PDF document text
    • https://zugimawaxudal.weebly.com/uploads/1/3/1/4/131410952/a1349f96f235.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386593/normal_6013ed4ccc4cf.pdfIn PDF document text
    • https://cdn.sqhk.co/nebemina/Xutihhi/nethack_sokoban_2.pdfIn PDF document text
    • https://dujefeva.weebly.com/uploads/1/3/4/5/134589135/mefuta.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391015/normal_601f3c43152f0.pdfIn PDF document text
    • https://bovabesizepin.weebly.com/uploads/1/3/1/3/131383515/1079889.pdfIn PDF document text
    • https://cdn.sqhk.co/wesebewoweva/HZsiShe/gefojutotugizasun.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445128/normal_5ffd471218257.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500883/normal_6001a50a71b14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380539/normal_600ba3e40c621.pdfIn PDF document text
    • https://nukogakulezov.weebly.com/uploads/1/3/1/3/131378840/7426725.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c3ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3AC 5332 bytes
SHA-256: d6322ec44875eda28b8453756023b5d31dd1aadb5568e71a84367ace9496d9e0
font_01_sfnt_off0000d5e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E3 10576 bytes
SHA-256: ba226fce651de04597b39d72a2bd392266275b435cdd5839da165f0bc541e733

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