Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a5502907ab139d4…

MALICIOUS

PDF

75.6 KB Created: 2021-03-20 19:23:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 99544a9555d950427eb508e0d1285174 SHA-1: 282b664849fbb0d0440e9f4d18841aa790daa358 SHA-256: 9a5502907ab139d4eb17744df04d3e76dfa1ebe870d8bead6486f9045662eb18
134 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 a heuristic indicating it's a link farm designed to obscure malicious links. The presence of a 'download button' heuristic further supports a lure-based attack pattern. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to a malicious site for downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://midufefew.ru/strik?utm_term=hide+download+link+wordpress+plugin PDF link annotation
    • http://jofifuneku.medianewsonline.com/hunger_games_catching_fire_watch_online_123movies.pdfIn PDF document text
    • http://damodudajipofem.22web.org/walmart_black_friday_deals_2020_hours.pdfIn PDF document text
    • http://sexugaweguko.iblogger.org/ket_exam_listening_answer_sheet.pdfIn PDF document text
    • http://pexawegowe.mywebcommunity.org/85415958068.pdfIn PDF document text
    • https://cdn.sqhk.co/fubafonu/Ggd7lhb/funniest_hilarious_memes_2019.pdfIn PDF document text
    • http://bubuwem.iblogger.org/school_annual_day_invitation_card_format.pdfIn PDF document text
    • https://cdn.sqhk.co/tamupoto/JhjajhX/rockauto_discount_code_where_to_enter.pdfIn PDF document text
    • http://gisimijesizugo.22web.org/why_is_the_brush_on_dyson_vacuum_not_spinning.pdfIn PDF document text
    • http://tunezazetadu.22web.org/56993510406.pdfIn PDF document text
    • http://lukegerit.22web.org/amelie_piano_noten_kostenlos.pdfIn PDF document text
    • https://cdn.sqhk.co/gukawaki/jaiiegc/george_strait_songs_after_2000.pdfIn PDF document text
    • http://tevoriveterusof.22web.org/siwizaru.pdfIn PDF document text
    • http://bugosegu.scienceontheweb.net/data_science_major_berkeley_prerequisites.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nekaxikafixof.epizy.com/jkbose_datesheet_of_class_12th_annual_2018.pdfIn PDF document text
    • http://zejenideve.rf.gd/introduction_to_personal_computer.pdfIn PDF document text
    • https://989244f3-426d-4557-b4f1-0018dac9047c.filesusr.com/ugd/57c819_e89b7017e97946d89dbfdc176dc32f01.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/308442d9-219b-4a58-96b3-afe0c8d2f36b/what_does_beast_from_water_mean_in_lord_of_the_flies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ba7d705-322b-4b1d-99eb-8d87a7ca92a3/musexiwosumilexelamurixu.pdfIn PDF document text
    • http://wuzorijo.rf.gd/jupobofubaxusuni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cae3f63-c746-4099-9116-b683b465cfc5/navy_seal_physical_fitness_requirements.pdfIn PDF document text
    • https://156bb51f-0b62-477f-88ca-8620af00812b.filesusr.com/ugd/e3ff21_e99873d681e04232baaa2fc62c8bf724.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/808b5f71-f98b-45df-8841-334b14024ead/33002848593.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/460b1884-638f-4096-9284-3b5996185dc8/why_did_radical_republicans_reject_the_ten_percent_plan.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_off0000ea97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA97 5244 bytes
SHA-256: 63faa818db7760f084c6514d1c2bcf845e40b41330ab984483adf31e7e1e5f2c
font_01_sfnt_off0000fc8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8B 10732 bytes
SHA-256: cc7d3811813274d3e6905b66379dcb5408ccff97a9d01ed9a10839dd9aaeaa55