Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c88c38c81539a0b…

MALICIOUS

PDF

76.4 KB Created: 2021-04-01 18:39:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a407732c600683198a928d24296ea6ae SHA-1: d00f83be94ee3958953f9ee101f621bc339f140a SHA-256: 4c88c38c81539a0b4bc81058f8ed178422671e6fc721b768c0b034afec73eb7a
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a heuristic identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://getazaxebu.weebly.com/uploads/1/3/4/8/134866961/xapuko.pdf
    • https://cdn.sqhk.co/bifugudawesu/gdhcmV9/troll_face_quest_horror_3.pdf
    • https://vegilumos.weebly.com/uploads/1/3/1/3/131383621/rimuvu.pdf
    • https://cdn.sqhk.co/towafeniruje/idBijvs/top_100_public_golf_canada.pdf
    • http://wildber.store/skullcandy_plyr_1_xbox_one_setup6qwcm.pdf
    • https://gotukedefiwukub.weebly.com/uploads/1/3/5/3/135309477/vuwakuvejetatenid.pdf
    • http://appless.space/esperanza_rising_spanish_versionlfhja.pdf
    • https://cdn.sqhk.co/jurugaguvedu/Zb7Ygem/71568112874.pdf
    • http://sowinod.mywebcommunity.org/wixusipefewinatilexe.pdf
    • http://power-guard.shop/50707734632fg3b0.pdf
    • http://habercigo.com/1363520641995lcs.pdf
    • http://nijalatol.mypressonline.com/apprendre_l_anglais_seul.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.indictrans.org
    • http://feedproxy.google.com/~r/wb/ENAH/~3/bVCGPfG74RQ/wb?keyword=think%20of%20meaning%20in%20gujarati
    • https://uploads.strikinglycdn.com/files/635205e2-601f-47a3-bc92-4a5ea4760e93/wujakevadejiruvinaji.pdf
    • https://03aaa7dd-6608-466c-a68c-f41c59811c05.filesusr.com/ugd/ae15ca_91aa5e1da2544444982a9c608b206b01.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4dd4dfbe-d031-4c4a-933c-5dc523e09fb1/champion_generator_4000_oil_change.pdf
    • https://f3dcd8e3-6656-4b47-a81e-a993d3c4f2a1.filesusr.com/ugd/aa9ef2_6ad28c0355fb4e26bdf126004150df18.pdf?index=true
    • https://uploads.strikinglycdn.com/files/42a013ae-0fa6-4480-8a64-387418a754fc/fefixukotuganuvenusanuvim.pdf
    • https://3d6da986-5be3-4955-9d5c-e891e6c56a45.filesusr.com/ugd/3c671a_f92bb14bb2964bad82fe59a828da12b2.pdf?index=true
    • http://mifojizu.myartsonline.com/automatic_irrigation_system_using_pic_microcontroller.pdf
    • http://gidubabe.myartsonline.com/gofizavenafoditodowarif.pdf
    • http://petojijoxura.onlinewebshop.net/lawikumuvirimok.pdf
    • https://uploads.strikinglycdn.com/files/67b7cffb-3e8b-4bdf-b661-d84e05efcb2e/driver_license_document_number_texas.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_off0000d7e0.bin
5a096a493465edef07bcc9bab0ddb42ea1ab493bce86ea0b580b58ca3c442307		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E0 5060 bytes
font_01_sfnt_off0000e8f4.bin
5d63a5c60f749a7ad88e000ab3cc34e3517728cf04dfd9a4d26f5c0e4feb5e60		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F4 6048 bytes
font_02_sfnt_off0000fc7d.bin
49df3434aef896165f0a8179bd2b96b363636528ff4ee7ffa884611b846d2c67		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7D 11888 bytes

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