Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bb37d3eeebc9268…

MALICIOUS

PDF

81.9 KB Created: 2021-04-04 17:03:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 69aafe1d60b6e46c72416192220c70ea SHA-1: 9f49bae6003e6e5abe4f5163b3ea953d78b728b6 SHA-256: 9bb37d3eeebc92683fddf9362bf0f935ecacb837f6c5787f97c12e35ba92b079
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://midufefew.ru/strik?utm_term=digital+design+jobs+london PDF link annotation
    • https://cdn.sqhk.co/pivugisaxap/7cXiajQ/74967386390.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425209/normal_6057c10c6f706.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421205/normal_5ffff9303c8ea.pdfIn PDF document text
    • http://gufutaca3.xyz/the_basketball_diaries_book_excerptsjn4yv.pdfIn PDF document text
    • http://fitokaps.xyz/how_to_fix_xbox_360_update_failedy1246.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392453/normal_60506393205f4.pdfIn PDF document text
    • https://cdn.sqhk.co/dabozijide/5hhhjgj/spinach_artichoke_dip_recipe_fresh_spinach.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484115/normal_60693945dcbae.pdfIn PDF document text
    • https://cdn.sqhk.co/tefazaturar/hhjgPYR/55562532014.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414488/normal_6041d18a78664.pdfIn PDF document text
    • http://zdorovie-vashe-vse.xyz/wiwenivimuloyen2u.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://7ed754b6-a209-4558-9281-0032c7ee8ade.filesusr.com/ugd/4329d7_71a600ca4f2a4fdbb8ad5d41e64bdb60.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/93c1e463-1f99-4f9d-b4c1-cf82c17198aa/what_to_use_instead_of_apple_pencil.pdfIn PDF document text
    • https://5c839259-519f-4cee-a1a2-6639d654070b.filesusr.com/ugd/140efa_134a5d7562a943ae98ad429105f4ac90.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5a31cf5-7e69-4f56-b331-11fa72082810/cost_to_build_an_indoor_soccer_facility_in_south_africa.pdfIn PDF document text
    • https://8aa13d94-a051-4bfa-911d-5e7c2f772018.filesusr.com/ugd/382cc4_a1ababcbb4304de2a7d73e3256ec194c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/70ed772c-51d6-4609-9a92-557717cc19de/gurobopirifo.pdfIn PDF document text
    • https://f414df59-d0c5-412c-8277-160bd92acc6e.filesusr.com/ugd/055bb3_1ea559198e3540898d2739cf76096481.pdf?index=trueIn PDF document text
    • https://7a1f2a0d-094a-4466-88af-72a4af93b9fa.filesusr.com/ugd/22739b_a9735667ee054ca18a24ef0ee9b82160.pdf?index=trueIn PDF document text
    • https://901b9152-9067-49c5-8541-bb90c1a77dfa.filesusr.com/ugd/5d84e8_83cdb93b28a64a3eaa006339443c82d3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/464b6764-894a-4d5f-91c4-f27e36ebd28d/chemistry_basics_free_download.pdfIn PDF document text
    • https://1eb42bdc-3da6-4b32-b75f-4382f1721f8e.filesusr.com/ugd/35474d_b4a750cf0ead4b7492f1561ad8deded0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b6dede5-5f0f-4eec-9ecb-9c424958cbdb/what_were_some_of_the_key_achievements_of_roman_engineers_and_architects.pdfIn PDF document text
    • https://71b4061d-0fbe-47a8-a671-08758978b022.filesusr.com/ugd/0216f2_88ee857a3c87454db03f7cbc6512ea52.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_off0000f764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF764 4900 bytes
SHA-256: 476a36a3ff42a787c7e41096fc526fdfd8000b854ba5cf29774b046b04595d0c
font_01_sfnt_off00010823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10823 10544 bytes
SHA-256: 3b89ba9ce64a0951b2af4531807c70913ebf3b8094667fe6c9ea82f1cdb0f376
font_02_sfnt_off00012c26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C26 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3