Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6f4307a31fdadf7…

MALICIOUS

PDF

73.8 KB Created: 2021-04-04 06:47:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: c9f1e96f18c11a460e67ecde20e176c4 SHA-1: 5a76e99cdf349dfe794b4601ee72726eb5e53f8f SHA-256: d6f4307a31fdadf7bc7d02d02ac22a97773b9f6f2fa0d4ec453d28cd94b55d71
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document was flagged by ML classifiers and ClamAV as malicious. It contains multiple embedded URLs, some of which point to link farms on disposable hosting. A critical heuristic indicates a 'Clipboard command execution lure', suggesting the document instructs the user to copy and paste content into a shell, likely to download and execute a second-stage payload. No scripts were extracted, but the overall pattern points to a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://druttle.ru/award?keyword=map+of+amsterdam+city+centre.+pdf PDF link annotation
    • https://cdn.sqhk.co/givifevulo/ggsq2wg/vujufojopinusuzi.pdfIn PDF document text
    • https://cdn.sqhk.co/nikofejujel/iceINja/hair_style_new_design_boy.pdfIn PDF document text
    • https://cdn.sqhk.co/dibidoretu/jiVhehi/62492421480.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410727/normal_602b430746415.pdfIn PDF document text
    • https://cdn.sqhk.co/nivurerazusa/ijgdghK/bugolimesum.pdfIn PDF document text
    • https://cdn.sqhk.co/wuwosexed/cLhbIij/48368955574.pdfIn PDF document text
    • https://cdn.sqhk.co/lewoxiguj/ejgPgjS/juvenile_detention_officer_skills.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470035/normal_5fdec9217cc99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381788/normal_6013f27e209a1.pdfIn PDF document text
    • https://cdn.sqhk.co/tisewesir/dhiiggd/atomic_fighter_bomber_full.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vajapojaperusu.myartsonline.com/27892669331.pdfIn PDF document text
    • https://s3.amazonaws.com/supefujoxopubu/57156648514.pdfIn PDF document text
    • https://s3.amazonaws.com/gumagabu/sukik.pdfIn PDF document text
    • http://bekusisit.atwebpages.com/factors_affecting_demand_and_supply_of_land.pdfIn PDF document text
    • http://pexitiwe.epizy.com/bofibinupiwazilaf.pdfIn PDF document text
    • http://jinesiwi.epizy.com/numajujatujimupapivinoga.pdfIn PDF document text
    • https://s3.amazonaws.com/wizuluworafid/funojogudedipajefaku.pdfIn PDF document text
    • http://jamowekovexure.epizy.com/march_for_our_lives_peace_plan.pdfIn 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_off0000de07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE07 5408 bytes
SHA-256: ea8829963bfeaf522f652e16ff4cd3f721bbc1ab60931f8a76e2d65320b86872
font_01_sfnt_off0000f077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF077 12656 bytes
SHA-256: b092abefd6a4465f0a1739d2848701b01378e8135af4c46b22bb3a9434a9d3b4

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