Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd49928283ca586d…

MALICIOUS

PDF

78.6 KB Created: 2021-01-24 04:42:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 7d689ab396a0dbfa388fb91c4a978cb4 SHA-1: 4374091e0a02ec29ad476d53bd0eb66241424f00 SHA-256: dd49928283ca586da24f7a1c12355fd9862e79b8499f01913b53072e471353fd
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a link farm strategy. The document body, though heavily obfuscated, contains references to 'hack and slash games switch', suggesting a lure to attract users interested in gaming to click on malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/123?utm_term=hack+and+slash+games+switch PDF link annotation
    • https://cdn.sqhk.co/wimakebibane/xOMghbY/7129800886.pdfIn PDF document text
    • https://site-1171487.mozfiles.com/files/1171487/comprehension_worksheets_for_grade_8.pdfIn PDF document text
    • https://cdn.sqhk.co/luxixumogez/WwQjbdF/life_of_a_mercenary_choice_of_games_walkthrough.pdfIn PDF document text
    • http://nilofebep.iblogger.org/70438486611.pdfIn PDF document text
    • http://laxetatisitu.iblogger.org/turojosizul.pdfIn PDF document text
    • https://site-1251208.mozfiles.com/files/1251208/airplay_app_iphone.pdfIn PDF document text
    • http://lajulufubugo.22web.org/miwaxemibuxipud.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388627/normal_5feef602eb25c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450889/normal_600723c7477be.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451755/normal_5fe00e3671f4e.pdfIn PDF document text
    • https://cdn.sqhk.co/zupisopad/X53ibhj/41291715687.pdfIn PDF document text
    • https://cdn.sqhk.co/wakivugex/cwgevsr/crash_bandicoot_on_the_run_ios_download.pdfIn PDF document text
    • https://cdn.sqhk.co/zezovajav/65hiGz6/6636391300.pdfIn PDF document text
    • https://site-1187532.mozfiles.com/files/1187532/67266813041.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fomobiwudaz.rf.gd/40706132057.pdfIn PDF document text
    • https://s3.amazonaws.com/wixamupelinere/breakup_goldboy_video_song.pdfIn PDF document text
    • https://s3.amazonaws.com/nefomojuwet/pirekegudevokigoditanop.pdfIn PDF document text
    • http://lugaderova.epizy.com/valgus_foot_deformity_pictures.pdfIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/administrative_law_in_bangladesh.pdfIn PDF document text
    • http://zejagal.rf.gd/schwab_inherited_ira_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/tixedujegibex/mediastinum_tumor.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_off0000f6dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DD 5376 bytes
SHA-256: 6f9e857d24167965ed8c9d3262cf945aea042d451840ac714d0b55eb2872b534
font_01_sfnt_off00010910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10910 10588 bytes
SHA-256: e953e15fda71c2f94b47da54c96e19744903bad182fb14de648caa5d5b7d442a

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