Malicious PDF — malware analysis report

Static analysis result for SHA-256 50d6c81ccaac202a…

MALICIOUS

PDF

97.5 KB Created: 2021-05-08 05:14:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: edc536ef03029988de5fea974f6ab667 SHA-1: 07e22bfb849a5acb92eba1d4be2905b29c397dd0 SHA-256: 50d6c81ccaac202adb2804b157e95d0ca2cefc26eedf53697cf0ae5c93e914d0
146 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains multiple embedded URLs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan delivery mechanism. The heuristic 'SE_CALLBACK_LURE' suggests a phishing pretext, likely to trick users into clicking the malicious link. The presence of numerous links on disposable hosting further supports a malicious intent, possibly for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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=charter+spectrum+reference+code+s0a00 PDF link annotation
    • https://cdn.sqhk.co/pibegufuxova/m70QYia/kunci_game_mekorama_level_13.pdfIn PDF document text
    • http://nesibobivugo.iblogger.org/gewipifuxa.pdfIn PDF document text
    • http://nulatapukedu.scienceontheweb.net/asus_x205ta_charger_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/tunuviju/MhipQif/4_pics_puzzle_guess_1_word_level_35.pdfIn PDF document text
    • http://joweponula.mywebcommunity.org/10413612782.pdfIn PDF document text
    • https://cdn.sqhk.co/dafagupovo/Zw7Uhf3/monza_sport_racing_seats.pdfIn PDF document text
    • http://befotuke.mywebcommunity.org/punctuation_worksheet_for_grade_6.pdfIn PDF document text
    • http://vijofudevadotar.mywebcommunity.org/cfdi_3._3_sat.pdfIn PDF document text
    • http://midarujiwuvi.mygamesonline.org/75645618386.pdfIn PDF document text
    • https://cdn.sqhk.co/devisojop/pV9geqT/40162847043.pdfIn PDF document text
    • http://kitukotobov.medianewsonline.com/sample_python_programs.pdfIn PDF document text
    • https://cdn.sqhk.co/munoforifuso/cBgihbM/16739463951.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://84bc2af4-305a-40b7-847c-8c52cb6b08d2.filesusr.com/ugd/a2e525_943aff3bc7ea4c2db2409807993c9bcf.pdf?index=trueIn PDF document text
    • http://numivonef.rf.gd/best_movies_websites_2019.pdfIn PDF document text
    • http://vexolofifete.atwebpages.com/88138334172.pdfIn PDF document text
    • https://7fad2989-91b8-457c-89bc-9a0e7aeef19f.filesusr.com/ugd/b03ff3_70cc2befeab84199b9938d3a3c7a5518.pdf?index=trueIn PDF document text
    • https://c33c3ce4-fa2f-4f19-9477-7a801b41b29e.filesusr.com/ugd/ebbcbd_f6fcf2ca194d44fe8fb282325f4b181f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbcaf48d-ec56-41d3-893d-35cd7dffaae0/muwozisapumojewuwowe.pdfIn PDF document text
    • http://dazozelagur.epizy.com/rifadivovowekigikix.pdfIn PDF document text
    • http://rabuxudizuxu.epizy.com/23734688932.pdfIn PDF document text
    • http://furipurisebete.onlinewebshop.net/calisthenics_workout_program_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9adf7e6-4bd1-4894-aba3-9bbbf7057df2/susenitatunovivadu.pdfIn PDF document text
    • http://givetupazowo.onlinewebshop.net/lehninger_biochemistry_book.pdfIn PDF document text
    • http://gukutimaguvuzum.onlinewebshop.net/gre_how_many_words_per_day.pdfIn PDF document text
    • https://76df98a8-3e94-4eee-a6f5-23e1de06049b.filesusr.com/ugd/54c74c_dfb0dab059624651977862b01ee5ad29.pdf?index=trueIn PDF document text
    • https://fdb4f28e-c637-431f-967d-457feef73efb.filesusr.com/ugd/cf5aa9_096a3b0741314b90b8874c87d82dcafa.pdf?index=trueIn 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_off00013c60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C60 5408 bytes
SHA-256: 7882606b4b8662f82dd2366b04954fdba2b7e3636e025be4b2b515d7cfe0f4c8
font_01_sfnt_off00014e9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E9A 12312 bytes
SHA-256: 62cc92d8c421daec8dbf428f4f858eb2cecdd8bf7622796193034c6c2b224190

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