Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc57b4c6d34bef7e…

MALICIOUS

PDF

77.5 KB Created: 2021-03-24 13:59:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c66654d3f17ccea09727415c75273c49 SHA-1: 7d72a84535033b0095d7ba869a010a152172a792 SHA-256: cc57b4c6d34bef7efc732694bff493d5d7c21e3dbf0310bf08e7335d44004f3e
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, with several pointing to suspicious domains and one specifically identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were extracted, the presence of external URIs and the overall heuristic analysis suggest the document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://soxebez.ru/award?keyword=test+para+evaluar+autismo+en+ni%25C3%25B1os+pdf PDF link annotation
    • http://sberbank.link/polekamdisln.pdfIn PDF document text
    • https://cdn.sqhk.co/fuperule/jXjfihV/job_confirmation_letter_after_probation_period_format.pdfIn PDF document text
    • http://laithub.pro/vemitilagewokutegadepuwr75w7.pdfIn PDF document text
    • https://cdn.sqhk.co/xanovixewin/T1idmPk/12668228186.pdfIn PDF document text
    • https://cdn.sqhk.co/wamiratena/ghCCigY/showed_you_my_answer_me_meme.pdfIn PDF document text
    • http://filanion.online/dungeon_master_screen_5e_espaoldri9t.pdfIn PDF document text
    • http://all-gopro.com/75583594985lyo1y.pdfIn PDF document text
    • http://rezumitisud.mygamesonline.org/dizowakutovagor.pdfIn PDF document text
    • http://tagoturuluro.medianewsonline.com/penny_stocks_list_2020_december.pdfIn PDF document text
    • https://cdn.sqhk.co/nijedesakuj/TTgjgd8/don_t_talk_back_to_parents.pdfIn PDF document text
    • https://cdn.sqhk.co/gobisurav/ighfigB/34775208492.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d27a0a4-a725-43ca-b22b-884ec8d55b36/21674485206.pdfIn PDF document text
    • https://s3.amazonaws.com/vipinib/xaroje.pdfIn PDF document text
    • http://bamonoxo.onlinewebshop.net/88841104630.pdfIn PDF document text
    • https://s3.amazonaws.com/xakapudakadu/allianz_malaysia_motor_claim_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5f6951a-6ad8-4cd5-bcab-be835f95dc60/kipolanawumojanigox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e14fcd2f-8b32-497c-ad66-0a0fcd3e11ef/hoover_windtunnel_rewind_vacuum_parts.pdfIn PDF document text
    • http://romakilax.myartsonline.com/capuana_profumo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f6c18f2-98ed-48f5-a958-d55142c38b5e/how_to_write_literature_review_in_research_proposal.pdfIn PDF document text
    • https://s3.amazonaws.com/zopenave/how_to_fix_sprinkler_timer.pdfIn PDF document text
    • https://s3.amazonaws.com/zopenave/what_are_two_characteristics_of_figures_in_ancient_egyptian_sculpture.pdfIn PDF document text
    • https://s3.amazonaws.com/zisulamisozoto/android_names_pic.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_off0000ee18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE18 5408 bytes
SHA-256: 75129a0e19803d6ea40ff76089c2fc50dfcfaa1db58b6b3ebcd9102944a837ff
font_01_sfnt_off00010025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10025 11864 bytes
SHA-256: cede77aa06453d311cefa3981d5db0b7192c294d822b13ff4840c57dd96dbdd5

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