Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c58d2284cbaf28b…

MALICIOUS

PDF

89.1 KB Created: 2021-05-01 06:41:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c178b6f42a2c180596d3342c75cf9d4d SHA-1: 958f14a15be462328daf9895f5525c479c3e4619 SHA-256: 1c58d2284cbaf28bd3ce258e1b2551fc5f7c2064044bdb7a4699c36fcc0ec397
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jumiwimov.ru/strik?utm_term=fate+rpg+skill+system PDF link annotation
    • https://cdn.sqhk.co/fewukise/heSjhM0/home_design_3d_freemium_para_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/nejisakatok/giijaxb/ultimate_off_road_builds.pdfIn PDF document text
    • https://wotufoxak.weebly.com/uploads/1/3/4/3/134308946/411fa5.pdfIn PDF document text
    • http://reactivaperu-viabcpi.com/wuwosepobixomerxm8sp.pdfIn PDF document text
    • http://wupulij.22web.org/cabomba_palaeformis_kaufen.pdfIn PDF document text
    • https://vujebitaj.weebly.com/uploads/1/3/4/7/134759162/xozufoboj.pdfIn PDF document text
    • http://veloxezidirexob.iblogger.org/physics_solutions_class_11.pdfIn PDF document text
    • http://trokot-shtorki.online/joxuxasogededuwitozt7xxy.pdfIn PDF document text
    • http://winnerslm.space/761918238274ax14.pdfIn PDF document text
    • https://cdn.sqhk.co/girewobo/hcIcB35/tezirolalazigi.pdfIn PDF document text
    • https://dasujodiket.weebly.com/uploads/1/3/4/4/134481559/8844897.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rozebofukixus/alan_walker_darkside_lyrics_video.pdfIn PDF document text
    • https://s3.amazonaws.com/jodabiladezot/guropojajizenodogekelebeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b88304e-bd81-40bf-8cd2-35177033b862/fl_studio_mobile_free_download_apk__obb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d587607-9764-45d5-9411-83e4459925ad/ragabuso.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_off00011e40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E40 5260 bytes
SHA-256: e3077ce1711bf81e69a9abcf8207bad0a6cce65a4960740a6b18d8c4d8baf8b7
font_01_sfnt_off00013022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13022 11212 bytes
SHA-256: 7e45ceeddba76b70e53a2510fd14800613d17eb3b1984462e7d07a5102c039bc

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