Malicious PDF — malware analysis report

Static analysis result for SHA-256 373128c07f7954fb…

MALICIOUS

PDF

80.7 KB Created: 2021-04-07 20:11:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 10ac436f93306a6f8350cb0696f0cc3c SHA-1: 1c7d35bb875c2d5403a8c74515146278ad923e3c SHA-256: 373128c07f7954fb8717020202289d5cb1089c26a5ecdfe69c49821a923b5a8e
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many of which are hosted on dynamic or unknown domains, suggesting a link farm or a distribution point for further malicious content. The PDF structure itself is also suspicious, with duplicate object definitions, indicating potential obfuscation or malformation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • 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://xajibur.ru/strik?utm_term=skyrim+race+guide+reddit PDF link annotation
    • https://cdn.sqhk.co/bamikalagov/g9eLEie/real_cricket_20_multiplayer_gameplay.pdfIn PDF document text
    • https://cdn.sqhk.co/koditisalupe/HHehbBs/95950982259.pdfIn PDF document text
    • https://webakutukulufu.weebly.com/uploads/1/3/2/6/132683024/9673624.pdfIn PDF document text
    • https://cdn.sqhk.co/towevefizub/2hcLigH/kumirodaworiweri.pdfIn PDF document text
    • https://cdn.sqhk.co/wekonexiw/jfsMINw/53006727541.pdfIn PDF document text
    • https://cdn.sqhk.co/pevipulakas/a7ivgEL/difonogamudokesudujedize.pdfIn PDF document text
    • https://cdn.sqhk.co/xoxapivasif/7ifhfjc/prince_sultan_armed_forces_hospital_madinah_address.pdfIn PDF document text
    • https://rijopadanag.weebly.com/uploads/1/3/1/0/131070137/xeposulaxobinunofumi.pdfIn PDF document text
    • https://cdn.sqhk.co/reriwoduriju/hha5thh/kesazudejafuwu.pdfIn PDF document text
    • https://cdn.sqhk.co/vilonunufuk/ieaCNAX/the_sims_4_money_cheats_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/muluxodipoto/h7jiaY7/zimsec_zjc_history_notes.pdfIn PDF document text
    • https://mafenipo.weebly.com/uploads/1/3/4/8/134879688/komumisagipeb-durofitijidod-zipusefaxixon.pdfIn PDF document text
    • https://cdn.sqhk.co/gegenosuzun/fjjibhf/28915148484.pdfIn PDF document text
    • https://cdn.sqhk.co/wovupeni/chekKLp/25424995137.pdfIn PDF document text
    • https://cdn.sqhk.co/miropefaneka/Iphejg6/nubewexaxukute.pdfIn PDF document text
    • https://cdn.sqhk.co/jurugaguvedu/if5Dggd/cute_simple_halloween_costumes_for_teenage_girl.pdfIn PDF document text
    • https://cdn.sqhk.co/jonuwezipagi/ghhgeej/76014355707.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/faca6feb-3c98-4100-bea5-e24ec9c9af80/the_raven_edgar_allan_poe_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4261451-2fc1-4720-b38e-1908e42ad6a5/ar_15_magazine_spring_replacement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cafd21b-b020-4d2e-be1d-e44411864c7b/more_movies_like_me_earl_and_the_dying_girl.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/133e112d-8d33-4054-a1c8-a5d182300497/lenovo_t420_ram_slots.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1417c92b-1b1b-4053-91d9-fff98b929a09/50850495270.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb5da3be-d84b-4744-afb5-369de7647742/kogobujowafa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37523040-cb00-434f-b6ca-1e6fb6080e9f/49277515088.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_off0000fece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFECE 5320 bytes
SHA-256: fd00cd7f9a5f3b185a41fbc7b9975d23c4d03ff207b2da5bdbc915777579007c
font_01_sfnt_off000110d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D8 10876 bytes
SHA-256: b6966434e747f10640ba268eaabc79a74105b2a6b6c8ef045b9bb4d42cc64d01

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