Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d4633e8d08f61ca…

MALICIOUS

PDF

86.0 KB Created: 2021-04-03 10:52:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb0b58aaf0d471d624e50f60fc4a95a3 SHA-1: 866db5af3216094b6fbc9391577fa93fc273ee05 SHA-256: 5d4633e8d08f61cacd21e07962b487b665d793476cb753f7ec4c3cb0229dd4b7
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a significant number pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains references to 'Auto dwg to pdf converter serial' and 'wkhtmltopdf', likely serving as a lure to trick users into downloading a malicious file or visiting a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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 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://pelibifir.ru/123?utm_term=auto+dwg+to+pdf+converter+serial
    • http://santaparker.store/9242899729i014r.pdf
    • https://nikidedinuxilal.weebly.com/uploads/1/3/1/4/131437821/4223921.pdf
    • https://cdn.sqhk.co/gavezexu/ifihhiS/71474701537.pdf
    • http://memowelubi.mygamesonline.org/62439709203.pdf
    • http://pomirkapa.site/kuzoganigilesujou40y9.pdf
    • https://luloxewawi.weebly.com/uploads/1/3/0/8/130874123/9eb24ef66d4c.pdf
    • https://cdn.sqhk.co/wudarivat/gc1hhjh/38211369960.pdf
    • https://cdn.sqhk.co/figesuweno/HP66igW/entertainment_coupons_near_me_now.pdf
    • http://bitsracing.net/cuanto_son_3_pies_y_8_pulgadas_en_centimetros1liy9.pdf
    • https://penogefuf.weebly.com/uploads/1/3/2/7/132740618/divigajowisuj.pdf
    • http://xufamorazogubov.sportsontheweb.net/asus_4g-ac68u_hard_reset.pdf
    • http://whalesqpa.fun/pegodibudezobutagotula97cwm.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://juzobezakugov.epizy.com/25280413280.pdf
    • https://s3.amazonaws.com/varolexexus/21387328686.pdf
    • http://rigamijuzekup.rf.gd/puwigade.pdf
    • http://kiwasebax.epizy.com/32366532643.pdf
    • https://s3.amazonaws.com/podawakumepewez/borderlands_3_ps4_performance_or_resolution.pdf
    • http://vebagakid.onlinewebshop.net/sawumanidigifanadunowu.pdf
    • http://kuwitabetegipo.myartsonline.com/kenya_budget_2020_download.pdf
    • https://s3.amazonaws.com/supefujoxopubu/brochure_cover_design_vector_free.pdf
    • http://xagunege.epizy.com/weekly_lesson_plan_template.pdf
    • https://s3.amazonaws.com/gewuwasi/81696292024.pdf
    • https://s3.amazonaws.com/fajixe/stage_performances_crossword_clue.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb38.bin
d4f51ab9393405350e05321362dc66d583a12c52ede59fe50a723505377fa3e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB38 5464 bytes
font_01_sfnt_off00010e02.bin
0147cc37a0e519121f601accf864c5a53eb9147a3886108937748fff331680d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E02 11408 bytes
font_02_sfnt_off00013527.bin
5338b60dac2ddcc9fbf81734882903060897ff8c18563aad6864a581beec55c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13527 16068 bytes

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