Malicious PDF — malware analysis report

Static analysis result for SHA-256 3511e0dd5f203917…

MALICIOUS

PDF

78.9 KB Created: 2021-03-20 03:01:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: ac879dbce4dc24dc15b3442770067313 SHA-1: 11c224f324c69ed08401112194fc1576b45d54b5 SHA-256: 3511e0dd5f2039177dc901bded0b862bc97a7e4b8213271b1da7ad7e71a900d9
166 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The presence of numerous external URIs, some on disposable hosting, and the 'MFA / one-time-code harvesting lure' heuristic strongly suggest a phishing attack. The document likely aims to trick users into clicking embedded links that lead to credential harvesting sites or exploit kits.

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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://jumiwimov.ru/strik?utm_term=sony+vegas+pro+13+tpb PDF link annotation
    • http://gnfcns.info/57719384883ijvhm.pdfIn PDF document text
    • http://rexevivejegox.scienceontheweb.net/biodegradation_and_bioremediation_martin_alexander.pdfIn PDF document text
    • http://kvrovk.xyz/what_is_bi-directional_fiber_testingcfqqo.pdfIn PDF document text
    • http://garantiya62.ru/vanenorafowaolxlx.pdfIn PDF document text
    • https://cdn.sqhk.co/damukowabij/ia9dmgj/sedijilolifiwugobemus.pdfIn PDF document text
    • https://cdn.sqhk.co/dovoxukeni/fjhjgng/11933778234.pdfIn PDF document text
    • http://sqrab.top/how_to_delete_history_in_chrome_on_androidbnis8.pdfIn PDF document text
    • https://cdn.sqhk.co/divojimo/q8Sjajh/rexakalimumopunafizitu.pdfIn PDF document text
    • https://cdn.sqhk.co/ragejeli/QhhhjXC/39706045986.pdfIn PDF document text
    • http://dnepr24.info/spiderman_mask_template_freec4sum.pdfIn PDF document text
    • http://gepexoliv.medianewsonline.com/wewukudikofiwerunu.pdfIn PDF document text
    • https://cdn.sqhk.co/jokawefezo/Jqhbigv/kenixuku.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://subogerilazelo.atwebpages.com/43300556576.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a95b941-7974-4ced-8b3d-969b741ddc0d/epson_m244a_ink_replacement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bad8ab1e-00b8-4082-aba2-93e390ce0a65/neopost_postage_meter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f59427d2-a7b6-48d8-9e33-9a7424bd7808/living_sober_book_amazon.pdfIn PDF document text
    • https://s3.amazonaws.com/lokijuronig/wuralevidimugima.pdfIn PDF document text
    • https://s3.amazonaws.com/bejexe/airtel_tv_pc_windows_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8678a671-6085-4950-ba0a-b243a3f3afb1/area-compound_shapes_l2s1_answer_key.pdfIn PDF document text
    • http://wodowepakimeko.onlinewebshop.net/reading_and_writing_curriculum_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9eb8e79-97af-4b75-8e88-c1cb671d28e2/vofufatomeledudul.pdfIn PDF document text
    • https://s3.amazonaws.com/tomamujuf/69201471432.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29a91c03-d4cf-41ac-845a-a276f2b0b422/does_zero_belly_diet_work.pdfIn PDF document text
    • https://s3.amazonaws.com/xufoxorog/19995420630.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_off0000f59d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59D 5576 bytes
SHA-256: 6393a96ac420eb109087f1274f835400a1dcdeb1ebf647d5db8a413142ab6714
font_01_sfnt_off000108be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BE 11276 bytes
SHA-256: 8897c4e93041e58ccfaf498cca19f82c6f92c8b81757b4d5fc254d07a3dcbc1e

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