Malicious PDF — malware analysis report

Static analysis result for SHA-256 4be6dc1201a59f41…

MALICIOUS

PDF

81.0 KB Created: 2021-05-14 12:54:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c39f6bc268b7f586d937ee1266dc00a SHA-1: 7026f26513cf9cff7cab8e06cbf1cbad46f37df2 SHA-256: 4be6dc1201a59f416fa0f9ece7964b1e0ed36e832dc134efc597a0fcacf2d376
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, as indicated by the PDF_SEO_LINK_FARM heuristic. While the document body is heavily obfuscated, the presence of numerous links suggests an attempt to direct users to external resources. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or link-farming document.

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://cdn.sqhk.co/wesuwajil/heggiaX/notekibadu.pdf
    • http://bakofutemuxasog.iblogger.org/vozinuluwumozibulim.pdf
    • https://cdn.sqhk.co/jirudumom/hbcial4/ff7_battle_arena_special_battle_rewards.pdf
    • https://cdn.sqhk.co/geruvijiwiw/bBdRzjb/todolist_microsoft_download.pdf
    • http://digogipexoluku.iblogger.org/capitalization_exercises_with_answers.pdf
    • http://digovin.getenjoyment.net/disadvantages_of_parliamentary_system.pdf
    • https://cdn.sqhk.co/luxixumogez/piigBjg/marshmello_face_fortnite.pdf
    • https://cdn.sqhk.co/xamitarerivu/ihjcij2/jakinaxovejaroredanaxare.pdf
    • https://cdn.sqhk.co/mikedeto/aOYBQii/kiddimoto_bmx_balance_bike.pdf
    • https://cdn.sqhk.co/rejiwosujupa/eDheies/university_of_montana_western_jobs.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://feedproxy.google.com/~r/wb/ENAH/~3/Xr6F2PkPTcg/wb?keyword=is%20feria%20hair%20color%20bad%20for%20your%20hair
    • http://kavuduvolilazod.myartsonline.com/17117750129.pdf
    • https://676a7a22-5bec-432e-92e0-9d4a0a27851c.filesusr.com/ugd/a1fb72_0a0425d20ca248c180f2d9c7f213718d.pdf?index=true
    • https://1c985592-4fe2-425a-b8d2-7dc24782370c.filesusr.com/ugd/a13bc2_84a94b690fb84d27a6a1a46adc618598.pdf?index=true
    • https://48cc712b-de5e-493e-a198-f8962849e22b.filesusr.com/ugd/d2751c_75a6b057ac444ddba8a5362e5db037b3.pdf?index=true
    • https://s3.amazonaws.com/dewutexorob/daihatsu_sigra_tipe_r_manual.pdf
    • http://vazibitadunowak.epizy.com/financial_accounting_2_mcqs_with_answers.pdf
    • https://s3.amazonaws.com/padosumifubobo/michel_de_montaigne_essais_english.pdf
    • http://befakugidutoj.rf.gd/19174183655.pdf
    • https://6e3eaeb2-b9dd-4462-8b56-96c59beebd9a.filesusr.com/ugd/dcc11b_c582b13d3b464e3e89b2840c04a6f64e.pdf?index=true
    • http://lopaxoreje.rf.gd/how_do_you_beat_a_1-3-1_zone_defense.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f004.bin
95c9ec54d8229a00490d590082c907fb1a0ae9e79aef7a38f25d0466ad28cb2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF004 4984 bytes
font_01_sfnt_off000100fa.bin
8c5affded108e6d8eebf9b2c60f978b100745e1c47b47901b85fe93145c81c0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100FA 11796 bytes
font_02_sfnt_off00012889.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12889 4324 bytes

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