Malicious PDF — malware analysis report

Static analysis result for SHA-256 aabd624d6a0360ae…

MALICIOUS

PDF

71.1 KB Created: 2021-03-07 22:31:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: cbd03c54b7b318ab3b991cb95571e523 SHA-1: b3083022cc281ccd0140ad6b53b5bac8693a119f SHA-256: aabd624d6a0360ae4e50eaec3b140effb80b35b4e80f083aaca48334eae29efa
184 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, specifically flagging it as a redirector to known malicious infrastructure. The embedded URLs and the structure of the document suggest it is part of a link farm designed to lure users to potentially malicious or scam websites. No scripts were extracted, but the PDF's nature points towards a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=eddie+bauer+high+chair+replacement+parts In PDF document text
    • https://cdn.sqhk.co/sofizagumup/uoiigfG/realm_defense_epic_tower_defense_strategy_game_hack.pdfIn PDF document text
    • https://cdn.sqhk.co/mipijotom/hbIPcyK/best_switch_multiplayer_games_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420029/normal_5ffcbbc77052f.pdfIn PDF document text
    • http://lorozetuwivu.medianewsonline.com/85039173895.pdfIn PDF document text
    • https://cdn.sqhk.co/zifalulog/bUjacgj/30304106742.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466680/normal_60009f4feb339.pdfIn PDF document text
    • http://zelumefepa.sportsontheweb.net/lorop.pdfIn PDF document text
    • https://cdn.sqhk.co/guwewaxa/l3Vha7x/burefinibiwerarutis.pdfIn PDF document text
    • http://saxobupazes.sportsontheweb.net/what_is_the_meaning_of_the_word_dialectical_materialism.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390095/normal_5fcecd71606b2.pdfIn PDF document text
    • https://cdn.sqhk.co/jivonaxadu/jjjH5ic/visexalibolokuretasawilus.pdfIn PDF document text
    • http://vehicleusains.com/74356364405rpi0v.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468534/normal_5fe2291167740.pdfIn PDF document text
    • https://cdn.sqhk.co/sevafeluba/ggTjehb/iphone_gmail_sign_in_required.pdfIn PDF document text
    • http://itawegan.space/cfa_level_1_20184minc.pdfIn PDF document text
    • http://copyrighthelpcentral.com/zarugajefuwousse9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368752/normal_6025362364dce.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB78 5356 bytes
SHA-256: b085fa821d60e5c0799f249afcb6dbb6a1f8a43e09ad1d80da70252a6eadcfe5
font_01_sfnt_off0000dd80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD80 10248 bytes
SHA-256: 830b616a4d3e9e119644ad44986fa507a461d4186e171c7c017fd0e77256e8c2
font_02_sfnt_off000100a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A4 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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