Malicious PDF — malware analysis report

Static analysis result for SHA-256 42c60dc23c3d90f3…

MALICIOUS

PDF

80.6 KB Created: 2021-02-24 00:01:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 1118f4e8a53b6fa877d937fe8695a138 SHA-1: 5dff69214e832db48df45712d933fe0f457aac64 SHA-256: 42c60dc23c3d90f34fbcaed1160580aaebec35c96cc61b2234062ad9254c3b8d
146 Risk Score

Malware Insights

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

The file is a PDF document that contains numerous external URIs, many of which point to disposable hosting and are used in link farms. Heuristics indicate a callback phishing lure, suggesting the document's purpose is to trick the user into calling a phone number. While no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or scamming operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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) 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://druttle.ru/strik?utm_term=ge+xl44+oven+knob PDF link annotation
    • https://cdn.sqhk.co/ridijafugemi/vjeIkji/soccer_world_cup_qualifiers_results.pdfIn PDF document text
    • https://cdn.sqhk.co/nomuzali/j2jcIgc/pixel_gun_online_unblocked.pdfIn PDF document text
    • https://cdn.sqhk.co/dajusonas/ljhggje/physician_assistant_vs_dental_hygienist.pdfIn PDF document text
    • http://womukob.iblogger.org/52585624585.pdfIn PDF document text
    • https://cdn.sqhk.co/vagofedewat/iciixRf/app_screen_recorder_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/lexewagoz/haajjgh/mobile_slot_games_that_pay_real_money.pdfIn PDF document text
    • http://instgramcopyrightdispute.com/where_to_buy_go_boarddw12h.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468827/normal_6024a71f6d6d8.pdfIn PDF document text
    • http://shoop-fk.ru/english_speaking_course_learning_videoghovy.pdfIn PDF document text
    • http://petrol-v-pol-price.site/60862796051c5vk7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461498/normal_5ff2302402712.pdfIn PDF document text
    • http://daravto18.ru/he_comes_next8s42v.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454289/normal_6015f1fba66a7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://xajalad.epizy.com/gizuwojakogadekedumo.pdfIn PDF document text
    • https://s3.amazonaws.com/pazovugal/the_impossible_quiz_2_answers_31.pdfIn PDF document text
    • https://s3.amazonaws.com/sogovekevi/rusofanusorefup.pdfIn PDF document text
    • http://nabafurulevu.epizy.com/abc_tv_reporters_australia.pdfIn PDF document text
    • https://s3.amazonaws.com/bejikefowu/date_a_live_kotori_spirit_form.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D7 4308 bytes
SHA-256: 786199c26cbc44ef96eddb32e96145dbe42f0bfd4b08e4ddf5dd0a7c3a304dda
font_01_sfnt_off00010391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10391 10444 bytes
SHA-256: 636ee55654434f972837fce2e6e535b1def2f18be275085ff27fd63d7dff762a
font_02_sfnt_off0001275d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1275D 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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