Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0c60ae31c04be24…

MALICIOUS

PDF

101.4 KB Created: 2021-04-01 04:41:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 0c36b5e07a43125ec9bd788864aa9e74 SHA-1: c21e594fb0db99f0b7312cdbc482df8d4fa71fe1 SHA-256: a0c60ae31c04be24c48a54dca894078d59181b4e314db326e0bca3e0ab76a9b5
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of embedded URLs, many pointing to disposable hosting, suggesting a link farm or SEO spamming operation. One critical heuristic identified a link to known malicious redirector infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/123?utm_term=captel+840+user+manual In PDF document text
    • http://paxezot.getenjoyment.net/boundary_conditions_for_magnetic_field.pdfIn PDF document text
    • http://vumajuzatijerak.getenjoyment.net/kemajomaripejikupezulipa.pdfIn PDF document text
    • https://xugomijomib.weebly.com/uploads/1/3/4/5/134578432/refak.pdfIn PDF document text
    • http://rezokivi.medianewsonline.com/49404535693.pdfIn PDF document text
    • http://xepuxesadara.mypressonline.com/positive_emotions_list.pdfIn PDF document text
    • https://winomumamo.weebly.com/uploads/1/3/1/0/131070375/2650047.pdfIn PDF document text
    • https://liletalezawo.weebly.com/uploads/1/3/4/5/134591830/7842314.pdfIn PDF document text
    • https://toraboretopupu.weebly.com/uploads/1/3/4/7/134769369/kozukafu-fekemerolu-voderumage-bakomivufe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/limewub/86817506928.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a5a9745-81a8-4bd8-ab19-d1576bf1b0c9/word_crossy_answers_2864.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f24c06de-7677-44ac-80f6-73441e35d567/hmdx_rave_speaker_disassembly.pdfIn PDF document text
    • https://s3.amazonaws.com/bodajaku/kezisukujuzamezipavu.pdfIn PDF document text
    • https://s3.amazonaws.com/zewimu/clavier_azerty_android_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed7952f5-8fc0-4ff5-9d01-48196066c8ef/behavioral_interview_questions_for_store_managers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cf077f9-8706-4d67-b7d0-e60932eee402/rv_furnace_not_working_at_high_altitude.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fd4a987-c3db-4925-9f81-985cb8da632f/413312936.pdfIn PDF document text
    • https://82cb18f6-4a40-4824-ac11-10070f72ce02.filesusr.com/ugd/5aec95_5a83f1c094544fc8942cfb21d9fc6d73.pdf?index=trueIn PDF document text
    • https://fdb4f28e-c637-431f-967d-457feef73efb.filesusr.com/ugd/cf5aa9_764fe5588c4749bebe3e09e42165fd5c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f825bea-79f6-435b-9773-1299ad589adf/lunoganeladuvexoto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a0ea73f-651b-429b-b37e-0a5143fba75f/94719147788.pdfIn PDF document text
    • https://3682d434-6e27-4ac8-9ac2-d3ec24fa429c.filesusr.com/ugd/9b5f63_3bd7eb526dda4ed08242ba3d14f011b3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e737450-1aa7-45a5-b9e0-f8bdff500ced/8145857182.pdfIn PDF document text
    • https://f9c380c0-3c9a-404e-8c76-a924832b335c.filesusr.com/ugd/9c8fb9_9963a751ec1942229a22db752472a1dc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ac582d2-5927-4bd8-b46e-b9f48808e3b1/ditamefuj.pdfIn PDF document text
    • https://s3.amazonaws.com/gozifep/sebikupavavove.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_off00014cd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CD5 5296 bytes
SHA-256: 7fc01c33aa1430ca36d9f53b503ebca005798d366fec88a4383d9d59e699d111
font_01_sfnt_off00015eba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EBA 11984 bytes
SHA-256: 8cf809ed22566af3224bd6891dfb7241b04c29ee5dbd324acdebf5f25244d130