Malicious PDF — malware analysis report

Static analysis result for SHA-256 f550097cdff00b96…

MALICIOUS

PDF

66.1 KB Created: 2021-02-28 06:04:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e53bb8f9ac64d9ca341908e0df7a8fa4 SHA-1: cdd4e9cdebce4f7da673efa5d4747cbad8d60999 SHA-256: f550097cdff00b96ba0589a2f472129a16328a88b6beefdccdd0cc2eba2f41b8
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious intent. It contains numerous embedded URLs, many pointing to disposable domains or link farms, suggesting a phishing or malware distribution scheme. The presence of external URIs and the 'link farm' heuristic strongly suggest the document's purpose is to redirect users to malicious sites.

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://ponafet.ru/strik?utm_term=kenmore+quiet+comfort+14+humidifier+filters PDF link annotation
    • https://cdn.sqhk.co/gatutojuse/ihhjhjg/music_id_app_free_without_wifi.pdfIn PDF document text
    • http://tijatanilipe.iblogger.org/asdf_lkj_typing.pdfIn PDF document text
    • https://cdn.sqhk.co/mogezunir/jbTxSsw/36550563669.pdfIn PDF document text
    • https://cdn.sqhk.co/wisisatofife/hC4GW5Y/defender_marine_free_shipping.pdfIn PDF document text
    • https://cdn.sqhk.co/duxevowoli/u2fibFn/88710689437.pdfIn PDF document text
    • https://cdn.sqhk.co/borefigux/fZhsjgc/fezumixifuwosasebexogageg.pdfIn PDF document text
    • https://cdn.sqhk.co/dibirolinu/dwggjgv/tetris_effect_connected_pc_release_date.pdfIn PDF document text
    • https://cdn.sqhk.co/kifuzopeko/ijihjN4/knight_rider_movie_2008.pdfIn PDF document text
    • http://tesar-krd.ru/17910102311yn4id.pdfIn PDF document text
    • http://form-copyrightservices.com/vodapejob53huv.pdfIn PDF document text
    • http://zodezabazigojab.iblogger.org/what_is_the_coast_guard_weight_and_body_fat_standards.pdfIn PDF document text
    • http://service-hire.com/google_pixel_4_voice_recorder_apkm18o2.pdfIn PDF document text
    • https://cdn.sqhk.co/rosisole/Fihhfc8/30964976537.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zafuriket.rf.gd/bubinikawunepipuvuw.pdfIn PDF document text
    • http://tapopopabe.rf.gd/13095463709.pdfIn PDF document text
    • http://koderozuxiritoj.rf.gd/why_is_my_alcatel_not_charging.pdfIn PDF document text
    • http://lujijetani.epizy.com/quotations_edward_bernays.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_off0000c4b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4B3 5284 bytes
SHA-256: 2ae47967b03f0025030ea907a2eba2756e822424e5b3652eb04d72adfa43c162
font_01_sfnt_off0000d698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD698 10328 bytes
SHA-256: 7a3f045fef4f129964ffa36aac44d5137f65ac22cc731ec12a15329500ec697b

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