Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9671508da678baf…

MALICIOUS

PDF

74.7 KB Created: 2021-03-20 05:48:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 880e6931077d148b4106649f4ead566e SHA-1: b85688da357c4028393d387473f8cd9b1d78c118 SHA-256: a9671508da678baffb17e2551cc7803f0e27a590ddb6faf3f643cb53934e4ae4
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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, indicating a high likelihood of malicious intent. The heuristics reveal it contains a large number of external links, suggesting it's part of a link farm or SEO spam operation, potentially leading to phishing sites or malware. The document body, though corrupted, contains references to 'Kendo chart series label template' and 'wkhtmltopdf', indicating a lure to disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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/123?utm_term=kendo+chart+series+label+template PDF link annotation
    • https://katudiwuf.weebly.com/uploads/1/3/6/0/136006549/3453500.pdfIn PDF document text
    • https://nugobobunebiset.weebly.com/uploads/1/3/5/3/135303429/a4cc79a.pdfIn PDF document text
    • https://sulewana.weebly.com/uploads/1/3/4/6/134605909/getomanedatimuw.pdfIn PDF document text
    • https://limikasideg.weebly.com/uploads/1/3/4/4/134446439/fevobajenabinuxom.pdfIn PDF document text
    • https://zeteleginogegop.weebly.com/uploads/1/3/4/5/134526156/natexuw-wozizewasome-lenelujojokalow.pdfIn PDF document text
    • https://faxarumi.weebly.com/uploads/1/3/1/6/131606834/a61b85e.pdfIn PDF document text
    • https://gumakini.weebly.com/uploads/1/3/1/4/131414358/lujudofevodo.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/wiremeresegikon/white_kidney_beans_nutritional_information.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1e14e5b-3660-47b1-a0f3-ee15e5dee7af/bazizenifexugapupazirig.pdfIn PDF document text
    • https://s3.amazonaws.com/baposivarabuj/takesatibafovajefowoliji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbd57a9c-2e65-454f-8189-2c868800983e/strength_training_program_for_weight_loss.pdfIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/modadodav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/743b528a-10c7-4e1e-a294-426136d581ee/bivekogaditelaso.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/52812368491.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71ed5c6f-197f-44c3-8e8c-aa067dcac316/zisujaselibu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2173b944-d397-4115-82f5-a83bcfd92aa6/toyota_rav4_fuel_mileage_1996.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5a85d3a-f2c0-4eb4-bc7a-a1b2eaec267c/91112124174.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06b751dd-2bdd-42d2-b9a3-c650d8a722d2/vokelexi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6caf7c0b-0a0e-4a73-8c7f-2da8e3359560/does_procreate_cost_money_on_ipad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30891823-1b00-4ef1-804c-13312bef5560/the_sea_of_monsters_chapter_1_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba7bde12-f164-4424-8592-4f0ba0ae2843/64466137771.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f9bc799-396d-4c51-9ab5-ec09afc3ab2b/fupoxoxewelaselefit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf0bee18-6fee-4b3f-a6ba-38660141ebc1/29753064406.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_off0000e424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE424 5424 bytes
SHA-256: 175518a99738fe6591bdf3b690d6094693dcf89e3b3823083321a00f74ea06d9
font_01_sfnt_off0000f663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF663 11496 bytes
SHA-256: a473b03c9add4d399f6bb7c562d501df4eab6302ee2dd0e6a4b7237c69d5ec95

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