Malicious PDF — malware analysis report

Static analysis result for SHA-256 712f71c1685d532c…

MALICIOUS

PDF

67.7 KB Created: 2021-06-09 20:16:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 6cbc33d0c4f09d8d5bf77c4eec919e57 SHA-1: 06a42bc0a9257397cec6dce407c01782707b1fa2 SHA-256: 712f71c1685d532c721facdd131109beffce13f8bb741e2f7c88bd5d6817a9a6
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to disposable hosting services, indicating a likely phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://crewmak.ru/pbw?utm_term=ben+10+omniverse+nds+rom PDF link annotation
    • https://nuwofukejixi.weebly.com/uploads/1/3/1/4/131437867/8331ae79add.pdfIn PDF document text
    • https://togurekeve.weebly.com/uploads/1/3/4/0/134040335/bfc346f1278.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414358/normal_5fc5b8e449daf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414335/normal_606e85235e50c.pdfIn PDF document text
    • https://fuxuvaxekanu.weebly.com/uploads/1/3/4/6/134648937/xugerire_volufa.pdfIn PDF document text
    • https://nizidisifa.weebly.com/uploads/1/3/4/5/134505067/3a7acec1.pdfIn PDF document text
    • https://zemijawa.weebly.com/uploads/1/3/1/0/131070152/gifelerexon-lefasafapu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496216/normal_6054849eb4147.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://garewewaziwu.pbworks.com/f/downton_abbey_piano_sheet_music_easy.pdfIn PDF document text
    • http://dibesusajob.pbworks.com/f/miwuwisunujo.pdfIn PDF document text
    • http://mibegenav.pbworks.com/f/vijikudubalewoxajanide.pdfIn PDF document text
    • http://kipizasuzeda.pbworks.com/w/file/fetch/144416763/acer_iconia_tab_a200_wont_update.pdfIn PDF document text
    • http://buluwogot.pbworks.com/f/evaluation_ce1_1er_trimestre.pdfIn PDF document text
    • http://nukuxim.pbworks.com/w/file/fetch/144886473/boat_battle_map_dd.pdfIn PDF document text
    • http://denipugo.pbworks.com/f/end_of_period_adjusting_entries.pdfIn PDF document text
    • http://beratirupo.pbworks.com/w/file/fetch/144741132/95106941485.pdfIn PDF document text
    • http://zuwofig.pbworks.com/w/file/fetch/144785547/fact_finding_report_format.pdfIn PDF document text
    • http://wekibivu.pbworks.com/w/file/fetch/144442779/rukiwodokudu.pdfIn PDF document text
    • http://natizasex.pbworks.com/w/file/fetch/144592446/19816474874.pdfIn PDF document text
    • http://paderukut.pbworks.com/w/file/fetch/144440439/how_hard_is_the_ma_permit_test.pdfIn PDF document text
    • http://movapog.pbworks.com/f/bikisijotenixejegure.pdfIn PDF document text
    • http://genarozep.pbworks.com/f/viva_video_download_for_pc_apk_android_free__pro_editor.pdfIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cdc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC0 5032 bytes
SHA-256: 784d30e808c101568c5ec1f119dd0177f34f1bce6dfc1a329ff38ef2e91ebc6c
font_01_sfnt_off0000ded4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED4 10112 bytes
SHA-256: 58079572ac09084fde216b81c34d262d6c036fd8512837c5140214599b62b25f

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