Malicious PDF — malware analysis report

Static analysis result for SHA-256 81fd7d173de4a0dd…

MALICIOUS

PDF

100.2 KB Created: 2021-03-14 10:54:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a7c5c32a24720a7f5c466ae560ca86d SHA-1: 8940e01158b23055d26e5f7c2459821e238b9857 SHA-256: 81fd7d173de4a0dd56529086ef80f8645153a7be83f71901a630bc5ac1bc1634
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of a 'PDF_SEO_LINK_FARM' heuristic indicates the document contains numerous external links, likely for SEO manipulation or to host malicious content. One such link, 'https://jumiwimov.ru/award?keyword=adb+android+tutorial+pdf', suggests a lure to download a PDF tutorial, which is a common tactic for distributing malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jumiwimov.ru/award?keyword=adb+android+tutorial+pdf
    • http://xoxapepagaxon.mypressonline.com/47095799909.pdf
    • https://degadita.weebly.com/uploads/1/3/5/9/135965793/mivizijuli.pdf
    • http://itfamily.pro/kujemovoxifhkyy.pdf
    • http://aov.one/709902655383610x.pdf
    • http://gopagafab.medianewsonline.com/physics_formulas_list.pdf
    • http://lubevos.scienceontheweb.net/66962423445.pdf
    • https://pibusabet.weebly.com/uploads/1/3/4/6/134695111/jojanejo.pdf
    • https://sozatugija.weebly.com/uploads/1/3/4/8/134859818/nukumevepo.pdf
    • http://xoxuvajes.mywebcommunity.org/busak.pdf
    • https://kowedanu.weebly.com/uploads/1/3/4/6/134687265/zuwitu-baxuxeti.pdf
    • https://waguxezemi.weebly.com/uploads/1/3/4/7/134703223/xozerev.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://wiwazisumi.rf.gd/how_to_find_a_google_classroom_class_code.pdf
    • https://uploads.strikinglycdn.com/files/1e4ca403-3a09-4fdc-9ee5-396d6863a730/nagukolak.pdf
    • https://uploads.strikinglycdn.com/files/8d33796e-f8b4-4f88-8edd-000d2755df77/poxejadeduwud.pdf
    • http://reronagut.epizy.com/16800537033.pdf
    • https://uploads.strikinglycdn.com/files/059e826f-5ede-44b0-886a-c3ea33760dbd/stihl_fs_130_specs.pdf
    • http://tirisesu.onlinewebshop.net/31680852223.pdf
    • http://lifinevedilubu.epizy.com/83279219392.pdf
    • http://sobofepexenux.epizy.com/2006_lanternfish_esl_water_cycle_answer_key.pdf
    • https://uploads.strikinglycdn.com/files/4a926d1e-265e-4990-866a-929e394a75ff/94363442155.pdf
    • http://xerifuxedu.rf.gd/spanish_imperfect_subjunctive_worksheet.pdf
    • https://uploads.strikinglycdn.com/files/1bfac949-1504-4958-898d-f82a573c4134/97439123662.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_off00013e1f.bin
b69b950b0573eace7ad017b6f4a911445e57aeaee601c850b4498f1967aa7d08		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13E1F 4748 bytes
font_01_sfnt_off00014e40.bin
3a83d7911784b627bde438638ca51177e99f169edcbb8c1dec8057dbeb18c958		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14E40 11808 bytes
font_02_sfnt_off00017686.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17686 4324 bytes

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