Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7f83eae116fc319…

MALICIOUS

PDF

74.7 KB Created: 2021-04-01 10:27:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4dcc37a1d2c5ff3c6088aaa27addf50c SHA-1: d67e2476f8226c84f2d44b127d2e23a693e46f34 SHA-256: c7f83eae116fc31905e8bf8d4706379b86aef766db81ca778c7f0802dd267278
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique often used for phishing or to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' suggest the document's purpose is to generate traffic to a network of linked sites, likely for SEO manipulation or to host phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/award?keyword=bill+of+lading+definition+pdf
    • https://static.s123-cdn-static.com/uploads/4369522/normal_5ffa4eeeadc4d.pdf
    • http://tokio-2020.fun/wosomop93f81.pdf
    • https://cdn-cms.f-static.net/uploads/4451210/normal_60411d2104e8f.pdf
    • http://vigastlens.xyz/xofafnvh68.pdf
    • https://cdn-cms.f-static.net/uploads/4427509/normal_6062ac5faea30.pdf
    • http://emirofficialzm.com/guide_stop_hemorroideszwfvu.pdf
    • http://lnstagramverifiedbadge-media.com/rulezokofugodunimicnsb.pdf
    • http://tixshopclub.space/55696610225pqwvu.pdf
    • http://evilcheats.fun/gojidawewofov4f6u.pdf
    • https://cdn-cms.f-static.net/uploads/4480878/normal_606398fe94b2c.pdf
    • http://zesamoa.online/the_story_of_the_human_bodytclui.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ecf1b359-4982-44d9-836f-7e6f5fec4aa1.filesusr.com/ugd/da15c8_215863d235df41d18351399997111191.pdf?index=true
    • https://3633ae4e-9acc-45df-885e-1bfa1481cb44.filesusr.com/ugd/e73054_8407b7a3bd32457dbe548de0431c89e6.pdf?index=true
    • https://79e8b926-cc52-4cef-90ae-68e3990d752e.filesusr.com/ugd/694d5d_99a6462af6c041b5a14318377e4f43e4.pdf?index=true
    • https://8994dc82-3839-475c-8de5-8afaa5c13229.filesusr.com/ugd/798b5e_56877dd13b9e48b38148c988d489e86d.pdf?index=true
    • https://1c8fadd7-09eb-4d2b-9d42-8e747ba5ce52.filesusr.com/ugd/60625b_614d0e2bb8c74457a11467cb56efab64.pdf?index=true
    • https://599b09cd-7b6a-4758-94a3-08a08d316165.filesusr.com/ugd/628a76_5d5c425b77d44988959b5daba7908b32.pdf?index=true
    • http://desakoda.rf.gd/lopifezenejulanipex.pdf
    • https://dca540c6-954d-4243-9f09-0921753db957.filesusr.com/ugd/974a4e_6348e7ce703c4b0ca2bcd091c49f9f9a.pdf?index=true
    • https://7fe1f042-206b-4735-a408-f56337efeeb4.filesusr.com/ugd/d34b51_3075c14069e4460684be452e06bb1246.pdf?index=true
    • http://jesebikalag.epizy.com/adobe_premiere_pro_cs6_64_bit.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_off0000e87c.bin
cf6fe75b91856d63c43c1071ca33d10316928fc21fafe33ab24144e51f4df5a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE87C 4984 bytes
font_01_sfnt_off0000f994.bin
014b215dbe64cb85847db3fefcab9c47815746f4ab993ed82606ea45cd568b8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF994 10568 bytes

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