Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5856eab29027879…

MALICIOUS

PDF

82.9 KB Created: 2021-02-15 16:32:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 225654d6918e92d50c4a4af46386a257 SHA-1: b20e0f8adea142ca2e91fba396476597a9d83d1e SHA-256: b5856eab290278790b7547fed9e1aaff74cf3b087e85c2603f9009ce0eadd11d
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm designed to distribute malware or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards a malicious document, likely intended to lure users to malicious sites via a 'scavenger hunt' pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://maypoin.ru/wix?keyword=bill+of+rights+interactive+internet+scavenger+hunt PDF link annotation
    • https://cdn.sqhk.co/baresupujar/cxFvLid/my_talking_tom_2_dragon_kingdom.pdfIn PDF document text
    • https://mapaforidax.weebly.com/uploads/1/3/4/0/134012560/mikufubufamigek-tunelekufatobov.pdfIn PDF document text
    • https://fupiledur.weebly.com/uploads/1/3/4/5/134527701/4676885.pdfIn PDF document text
    • https://meliwuka.weebly.com/uploads/1/3/2/7/132740471/4098762.pdfIn PDF document text
    • http://bostpolamos.site/covet_fashion_dress_up_game_for_pcryzf2.pdfIn PDF document text
    • https://vulalubog.weebly.com/uploads/1/3/4/8/134862436/sisajiregu-zunaxijedovese.pdfIn PDF document text
    • https://cdn.sqhk.co/rokabumake/21lhijb/grand_prix_story_best_ice_car.pdfIn PDF document text
    • https://cdn.sqhk.co/nifodotiriru/kRu2jhj/xagejukoneba.pdfIn PDF document text
    • http://legalvictory.group/32293269079zk9y9.pdfIn PDF document text
    • https://cdn.sqhk.co/bolomekurufe/0jbCBii/street_fighter_4_ce_apk_full_unlocked.pdfIn PDF document text
    • https://rerararomimin.weebly.com/uploads/1/3/1/3/131383042/7451706.pdfIn PDF document text
    • https://popetebebulexu.weebly.com/uploads/1/3/4/3/134316921/edaa947dd9.pdfIn PDF document text
    • http://mir23.xyz/ghost_scanner_appsv843k.pdfIn PDF document text
    • http://hamsterbig.com/taribokisxs63u.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/wuwabobujasivor/parurunuvubiserivuw.pdfIn PDF document text
    • https://s3.amazonaws.com/rekorewexidiwo/ajit_singh_new_song_video.pdfIn PDF document text
    • https://s3.amazonaws.com/lolijexejomak/groundsel_bush_fact_sheet.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_off00010764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10764 5252 bytes
SHA-256: c39022c3ab630a2edb59b9829f27db4209ea05242089e3098cfc26784c5c4812
font_01_sfnt_off0001194c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1194C 10748 bytes
SHA-256: 2834de1fe5c1144d7f2495aa092efc7565451b0a186d237c5d427e3339accd19

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