Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dfbed454cd66716…

MALICIOUS

PDF

77.5 KB Created: 2021-03-18 14:17:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 78315941f08cdeb5d2710487b1150700 SHA-1: d9cf12ceb9d4288713a9e3c690418825158f90a0 SHA-256: 7dfbed454cd66716537a07c6ec60bf7394c1323a310a4931af2c9cce16ff15ec
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'link farm', suggesting a malicious intent to direct users to potentially harmful websites. The ClamAV detection and ML classifier strongly indicate this PDF is malicious, likely used for phishing or distributing further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://resalured.ru/wix?keyword=ap+biology+chapter+7+study+guide
    • http://white-x.fun/ice_cream_sandwich_nutrition_sugar73o0u.pdf
    • http://toppiksnack.xyz/does_comcast_have_a_dvriyp0a.pdf
    • https://gijowazav.weebly.com/uploads/1/3/4/0/134097260/pavumotexudajaxenu.pdf
    • https://jovawovifo.weebly.com/uploads/1/3/4/8/134883275/favexalodewozu.pdf
    • http://moymagazin.xyz/bidexekimudivotenugqy764.pdf
    • https://tesegedoveveda.weebly.com/uploads/1/3/4/8/134891870/kakiwajojul-gamojonana-vawix.pdf
    • http://pe50off.pro/guilty_gear_accent_core_plus_story_guidezgnwx.pdf
    • https://nuwukovodikala.weebly.com/uploads/1/3/4/6/134666266/nibeganugo.pdf
    • https://norofuzalugegok.weebly.com/uploads/1/3/4/8/134882219/natiresuji.pdf
    • https://xirazaju.weebly.com/uploads/1/3/4/8/134859293/digaluwubu-wunadanunew.pdf
    • https://wobanuwu.weebly.com/uploads/1/3/5/9/135959505/wejibilerafup.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://f9cb7010-568c-45d0-b0a5-7bd630b60272.filesusr.com/ugd/b10ea2_595fa1b2922f4870ba2efde32cd3f996.pdf?index=true
    • https://a9750898-a066-404d-a796-54a2f5ad13bb.filesusr.com/ugd/60231a_d4945566bf1744d39d2facfe42676db5.pdf?index=true
    • https://006b50d4-ad2a-4261-8279-34542eb0d7b0.filesusr.com/ugd/a640e9_c34b39739aa14e52a64262de7359f665.pdf?index=true
    • https://s3.amazonaws.com/vizegemawokaxe/project_scope_statement_sample_pmbok.pdf
    • https://s3.amazonaws.com/dobikasukavu/dream_league_soccer_mod_apk_apptoko.pdf
    • https://203aa715-7352-46b1-b16b-5d0aeeaa27a2.filesusr.com/ugd/0582e0_c3f311b74a1d4676af901be93ab00a85.pdf?index=true
    • https://35b1a599-9f45-4897-82ce-59a931fc5495.filesusr.com/ugd/daca0d_78b09b659b4f4bb0bb638eab4c6d88f4.pdf?index=true
    • https://b913155d-2712-4fd4-bcc6-651970a8c456.filesusr.com/ugd/e39924_98d715d3a8ea4fdb9739931541b1b54c.pdf?index=true
    • https://s3.amazonaws.com/kukupunopedon/gastrointestinal_system_physiology.pdf
    • https://1ce8651a-bfbb-4b9a-b1bf-24b3b574775a.filesusr.com/ugd/ac72e0_739e4fd46ab64f2c97af297ab591acb6.pdf?index=true
    • https://s3.amazonaws.com/fevobelijogal/wood_bed_frame_platform_queen.pdf
    • https://36071b1a-d853-4ad1-bccf-0ed894d94038.filesusr.com/ugd/906e9f_3bb9c41f13a74059835838f084ecb3b4.pdf?index=true
    • https://6f847715-c85a-45d9-ae5c-7c68cc800588.filesusr.com/ugd/6e100b_b9e53329a3824e199a817afb93b9f4ae.pdf?index=true
    • https://s3.amazonaws.com/zubuwujoxom/novifozake.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_off0000f079.bin
53bcec6a03fdec0cdf51579ca9f7c083c4a9b25767496c84294fe709f1980386		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF079 5648 bytes
font_01_sfnt_off000103b0.bin
e5d4c56bdc00d1d367519be81d5157bf286c5f5932ad7401fc30b810d943b1b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103B0 10700 bytes

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