Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3a5c23404335871…

MALICIOUS

PDF

74.9 KB Created: 2021-03-27 23:21:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: d39538fff7fb0100fb62a15912ad7ad1 SHA-1: bcb5e102cf923477c72aa93e7b4c3ece3a39baf8 SHA-256: a3a5c234043358710805ba5a6cc2705856086bcaddea6cfd70923a9e9bb260be
186 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or redirection scheme. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, hinting at its generation. The presence of PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics strongly suggests the document's purpose is to drive traffic to external sites, likely for malicious purposes such as phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://lozipotod.ru/wix?keyword=dbt+manual+pdf PDF link annotation
    • https://cdn.sqhk.co/vopupevomate/fMhjCjj/lab_escape_room_urbana_il.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447646/normal_5ff948a6281be.pdfIn PDF document text
    • http://netewe8.xyz/91546370514uf7k2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482882/normal_60360bca685e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426828/normal_6046e011653ea.pdfIn PDF document text
    • http://natorg.fun/how_to_use_fluke_intellitone_pro_200lvqpg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496826/normal_601911594c616.pdfIn PDF document text
    • https://cdn.sqhk.co/kizewetete/jbYgjac/hashtags_to_use_for_more_likes_on_instagram.pdfIn PDF document text
    • https://cdn.sqhk.co/farafakilof/2hgDhib/setozotumiparutekalak.pdfIn PDF document text
    • http://raisinslabs.club/05_chevy_malibu_oil_life_resetr22t7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417669/normal_5fe7487141a1c.pdfIn PDF document text
    • https://cdn.sqhk.co/jotenitix/jHL5Fmg/tiki_taka_soccer_drills.pdfIn PDF document text
    • https://cdn.sqhk.co/verexoleki/9C6jb13/shark_ion_f80_multiflex_target.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://d4078116-a2d5-466f-97e6-20d899f6ca30.filesusr.com/ugd/576447_4a2a063babb0421b8c4e5f0c90f7b3e8.pdf?index=trueIn PDF document text
    • https://b3df6b87-ca8d-4c26-b815-8c697753997b.filesusr.com/ugd/896a32_7cf5ab45aa084d278a0c0abda2ce8e14.pdf?index=trueIn PDF document text
    • https://80c8fd16-4cf8-4f9f-b52b-d6c956df8f3b.filesusr.com/ugd/1a94e8_fc949b149d124a258fcd58a76a9e136f.pdf?index=trueIn PDF document text
    • https://5da1c7d8-01c4-4175-bbf8-c25915566394.filesusr.com/ugd/1084fb_495f3b43a94a4b6388d2ab92f2b6897b.pdf?index=trueIn PDF document text
    • https://43e3b293-20b6-4b74-9f7d-0eefffb4d2df.filesusr.com/ugd/11595e_80ca8520f1df403fb116e77987d8ae36.pdf?index=trueIn PDF document text
    • https://77bac38d-831a-46d6-8f22-d7743fcadc58.filesusr.com/ugd/5b9a87_b6aa6e712c2d45dbb28b09392167a968.pdf?index=trueIn PDF document text
    • https://18574fdc-dbe8-4f24-a3f7-ab3d6ff540e7.filesusr.com/ugd/d45bfa_3b486deb6bbd47399667d71593841afa.pdf?index=trueIn PDF document text
    • https://0ed7c29b-d5f2-4290-8b47-add6aa38300d.filesusr.com/ugd/32a223_e56b2259cd7e4184a6d6a49e60f66dfc.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC8 4656 bytes
SHA-256: 312e12eb20a376058271b9f9c88cc3869f354fc33549f49e64d1573c90828d57
font_01_sfnt_off0000ed72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED72 10248 bytes
SHA-256: 972ab40c6b1cdf8f618671308c034a487a55cae0ce6d3e1c4b0cd02ce673607b
font_02_sfnt_off00011085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11085 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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