Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6634cd61aa9c1b0…

MALICIOUS

PDF

87.8 KB Created: 2021-03-31 17:10:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ced8af4ebd9b996d0e7e7c229356c531 SHA-1: 21d97bbb8f05932fee481f585c5cede281f50d1b SHA-256: d6634cd61aa9c1b04c9b6fb165a3d47860a18992f624ddeb01140ca12ca57512
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm with numerous external URLs, many hosted on disposable domains, suggesting a phishing or malware distribution scheme. The presence of 'joker google docs mp3' in one of the URLs indicates a potential lure to trick users into downloading or accessing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://maypoin.ru/wix?keyword=joker+google+docs+mp3 PDF link annotation
    • http://dexuposi.sportsontheweb.net/3089343924.pdfIn PDF document text
    • https://cdn.sqhk.co/numovasovev/Tlxrogf/steam_download_slow_and_stopping.pdfIn PDF document text
    • https://cdn.sqhk.co/dudavizi/jfZicQ6/epic_seven_fodder_leveling_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/bavozazav/Fhijehh/87361735351.pdfIn PDF document text
    • http://xiwesesakuvel.medianewsonline.com/76471719588.pdfIn PDF document text
    • https://mefutugotipefij.weebly.com/uploads/1/3/5/3/135304762/75d73ba.pdfIn PDF document text
    • https://cdn.sqhk.co/lafuwexale/hNihIJJ/download_carnivores_ice_age_full_version_free.pdfIn PDF document text
    • https://sudegefaxir.weebly.com/uploads/1/3/5/3/135323135/nutomibufitaj.pdfIn PDF document text
    • https://cdn.sqhk.co/wosipuvetot/GGhbGwh/tobofagavizipuzudidub.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/a6032a7a-85c7-4843-955c-6b8c8c2ba2fc/universal_audio_apollo_twin_x_usb_c.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/104a910e-9c51-4a8a-972d-0a47b8bbc94d/fibizugazovozikiwotuv.pdfIn PDF document text
    • https://29159626-56e2-4eb2-a8c1-eb081f451e44.filesusr.com/ugd/a58502_1a37aeb2ed4f4a8aaa6c36de5ef76f92.pdf?index=trueIn PDF document text
    • https://c84ffda1-e72a-45fa-8ce8-a771970cf326.filesusr.com/ugd/9fd656_69ddf6368d8842339a99f52a6517d502.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bfa757e-9d87-41d8-9d46-9d7422e9557d/sudixekapuwisedinawibik.pdfIn PDF document text
    • https://s3.amazonaws.com/zafijukopa/49623537666.pdfIn PDF document text
    • https://8ac5c8e1-9174-427d-95c2-90bebb9f105a.filesusr.com/ugd/44b221_659b71233bff447a84efcd14055ac0d1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dejolavubukugeb/viberore.pdfIn PDF document text
    • https://s3.amazonaws.com/kelageketisefuv/fermentation_lab_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/woxewiwupir/chemical_bonding_notes_class_10.pdfIn PDF document text
    • https://7fd672c9-0ac8-42d3-9d3c-9ebb2fbea2b4.filesusr.com/ugd/92785a_1e5460f7ecc64527b76f3cac19c9a261.pdf?index=trueIn 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_off000114e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E8 5400 bytes
SHA-256: 5821a565af4fd29ad591a1ec34f0b2bb4daadb8a288ba66c56e0574366ab67a0
font_01_sfnt_off0001273c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1273C 13648 bytes
SHA-256: e9f98865b6e211be4253817120f7d28429046415f83af5ceff1a20889ded1259