Malicious PDF — malware analysis report

Static analysis result for SHA-256 503b7ab0ec3dcff5…

MALICIOUS

PDF

79.6 KB Created: 2021-06-01 14:32:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 7901ea5be3b1a817f552c8c7337ab889 SHA-1: 4fa65d9bcfad9107091c79c59854424a65bb1bef SHA-256: 503b7ab0ec3dcff51609363f294adba030648ba95683426a3123af77d00de53a
186 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large number of external links, indicating a link farm designed to redirect users to potentially harmful content or for SEO manipulation. The presence of embedded URLs and the ML classifier output further support its malicious nature.

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 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.
  • 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://philabc.ru/pbw?utm_term=can+you+become+a+vampire+in+skyrim+ps4 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4391037/normal_5fc8fdbbadcbb.pdfIn PDF document text
    • https://vabemeraronoj.weebly.com/uploads/1/3/1/4/131452983/7149955.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466675/normal_606e82f02dec4.pdfIn PDF document text
    • https://jijajaxasivezix.weebly.com/uploads/1/3/4/5/134588510/vujobevetexamif.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/eba473ed-dc32-4e82-b87f-e7a3d8a1829c/duxijoroliduwomeduworofif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08f91de5-8123-4311-9fd9-667cf12063d9/77186404082.pdfIn PDF document text
    • http://tosuvop.pbworks.com/w/file/fetch/144451305/dagefijixi.pdfIn PDF document text
    • http://supatibu.pbworks.com/f/how_to_change_gears_in_a_manual_car_smoothly.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7df79904-ba3c-47cb-9c8a-5650faac7074/microsoft_project_manager_interview_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ba913e5-61f9-4830-a00e-6470079ca74c/roku_streaming_stick_plus_or_amazon_fire_stick_4k.pdfIn PDF document text
    • http://vawaguzidatu.pbworks.com/f/boxivefobifi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f43298f-a6de-4a04-9180-9d2cc233f0c3/xudiro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70fbb360-59dd-4cb6-817c-63314941c6f1/sony_dvp-sr200p_b_dvd_player_black.pdfIn PDF document text
    • http://zajozote.pbworks.com/f/vawokiwizukakalezaromitem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e75a063-01e8-4070-a668-bcdb3fffc4af/dawenilojoga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cf9e393-2142-4c2f-8060-a182142555d5/who_made_up_each_of_the_three_estates_in_france_prior_to_the_revolution.pdfIn PDF document text
    • http://nusuwoxub.pbworks.com/w/file/fetch/144422373/how_long_it_takes_for_tadpoles_to_turn_into_frogs.pdfIn PDF document text
    • http://xutosop.pbworks.com/f/10524814666.pdfIn PDF document text
    • http://fubajulak.pbworks.com/w/file/fetch/144426132/zexanemilibofogupuvuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0798fee-64e6-4dbf-b753-0fe3f309e681/how_to_use_a_keurig_single_serve_coffee_maker.pdfIn PDF document text
    • http://tagexoba.pbworks.com/w/file/fetch/144422991/bahubali_3_movie_download_in_hindi_hd_720p.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/182573ed-c498-410a-9b4d-6cb45b8db86f/kesebixupudalixe.pdfIn PDF document text
    • http://wotasaful.pbworks.com/f/83137869982.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_off0000fb3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3B 5408 bytes
SHA-256: 8ef2e65b280f3bc29c1352002d98428b962e25ff4d645d6636708cab3fbd70b6
font_01_sfnt_off00010d97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D97 10464 bytes
SHA-256: 9bac9a060cd7d3ee3db46769412b6cbfde815a8136e7bc3e66ab404e15301def