Malicious PDF — malware analysis report

Static analysis result for SHA-256 1228ec6549e5e5be…

MALICIOUS

PDF

73.1 KB Created: 2021-03-02 14:01:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 5a9ca438ae848143646153b9be729ed2 SHA-1: 0588fe5e1d9aeea154f6adc4150c08c53be9ed23 SHA-256: 1228ec6549e5e5be743053b0387edab6e921ed52be974ad610b55e690847591c
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many of which point to disposable hosting or known malicious redirectors, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites for further exploitation or credential harvesting. The document body itself is largely unreadable binary data, offering no direct content-based clues.

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
  • 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 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.
  • 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/123?utm_term=lockpickinglawyer+best+motorcycle+lock In PDF document text
    • http://rafewasugajeze.22web.org/dogapekukejuke.pdfIn PDF document text
    • http://powajaxib.medianewsonline.com/59793038343.pdfIn PDF document text
    • https://cdn.sqhk.co/kewusikata/sf5Qigd/lukozebitikob.pdfIn PDF document text
    • https://pegugigatusib.weebly.com/uploads/1/3/4/4/134460290/zagaparu.pdfIn PDF document text
    • http://uablog.website/leadership_skills_resume_phrases_exampleslk6mk.pdfIn PDF document text
    • https://cdn.sqhk.co/kadeposamo/ggZjiua/majaburuguxaniwo.pdfIn PDF document text
    • https://cdn.sqhk.co/sesudegaruta/gcPOib2/tree_dollar_careers.pdfIn PDF document text
    • http://pinegobojefo.getenjoyment.net/adobe_premiere_pro_cc_2015_tutorial_slow_motion.pdfIn PDF document text
    • https://vigoxanumevu.weebly.com/uploads/1/3/4/4/134466257/6938972.pdfIn PDF document text
    • https://cdn.sqhk.co/sovokeduseb/hahgjdq/candy_crush_saga_gameplay_android.pdfIn PDF document text
    • http://nemugub.mywebcommunity.org/how_to_reset_my_rinnai_heater.pdfIn PDF document text
    • http://fitness-ital.fun/powerflex_525_fault_codes9umu6.pdfIn PDF document text
    • https://cdn.sqhk.co/kesokirow/EmQl1ge/sniper_legend_free_movie_download.pdfIn PDF document text
    • https://negapisege.weebly.com/uploads/1/3/4/6/134635707/5313904.pdfIn PDF document text
    • https://cdn.sqhk.co/vekasurox/DDXhgjc/randall_road_animal_hospital_south_elgin.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://virefixifefuke.epizy.com/banjara_new_song_com.pdfIn PDF document text
    • http://rovikejovejoto.rf.gd/2989095454.pdfIn PDF document text
    • http://putajamesar.rf.gd/gakexasujumarurek.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_off0000e27a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27A 5592 bytes
SHA-256: 8fb8184d8e96c9073835cbfc90f8a683f1ab62e55102336377c54e56cf524dad
font_01_sfnt_off0000f599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF599 9868 bytes
SHA-256: 09dd9f19704619241c7f67a45ff1dc4d742c9d62de20b53eff2418ae9b24022f

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