Malicious PDF — malware analysis report

Static analysis result for SHA-256 6537a038a8aa5c58…

MALICIOUS

PDF

81.9 KB Created: 2021-03-14 00:55:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 50bdb6329b5daa9a813c9c7fcf99942c SHA-1: bd59e5307268f8db0a6cc8a55d90bf596ac20f5d SHA-256: 6537a038a8aa5c58721c79390ecd400312cf50bbd7ceebefade0e9b4c913e92b
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links to various domains, many of which appear to be disposable or used for SEO link farming. The ML classifier and ClamAV detection strongly indicate maliciousness, with ClamAV identifying it as a phishing trojan. The embedded URLs and the PDF structure suggest an attempt to manipulate search engine results or redirect users to potentially harmful content.

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
  • 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://jumiwimov.ru/wix?keyword=save+the+last+word+for+me+strategy+pdf PDF link annotation
    • https://tazerodine.weebly.com/uploads/1/3/4/5/134598813/zosaseguromi_tawevorexirebo.pdfIn PDF document text
    • http://ita-bio.space/68345937666xntd0.pdfIn PDF document text
    • http://center-about.com/17044700207qh2m7.pdfIn PDF document text
    • http://gnoogle.site/best_online_chess_tactics_trainingso934.pdfIn PDF document text
    • https://ruvawuwejijexut.weebly.com/uploads/1/3/0/8/130814193/votemowago_bixakix_zisideku.pdfIn PDF document text
    • http://lamanixumerad.mypressonline.com/17700407016.pdfIn PDF document text
    • http://tokesuditetu.getenjoyment.net/impact_of_packaging_on_consumer_buying_behaviour_questionnaire.pdfIn PDF document text
    • https://selamosufuk.weebly.com/uploads/1/3/4/4/134463567/9047528.pdfIn PDF document text
    • https://guxulixekakuved.weebly.com/uploads/1/3/5/2/135294256/fumeviluweka_kekovigosan.pdfIn PDF document text
    • https://jokazetesolibut.weebly.com/uploads/1/3/5/3/135314514/b39bf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/dobikasukavu/sititekiz.pdfIn PDF document text
    • https://f110cc6a-49d6-427c-9ab6-a3a4d323b004.filesusr.com/ugd/9e53d4_0587449d6f464f16a5ac1d30f9151a4c.pdf?index=trueIn PDF document text
    • http://wikukodukoja.onlinewebshop.net/44532188880.pdfIn PDF document text
    • http://moxosutemow.onlinewebshop.net/nixawo.pdfIn PDF document text
    • https://s3.amazonaws.com/votubukaxogilix/geresurejivevu.pdfIn PDF document text
    • http://zotubune.myartsonline.com/pazugavubaxovaviwikebur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c10e2a8d-1b0d-4b8a-a976-35ba6a82ee1b/kugob.pdfIn PDF document text
    • https://0dd0cd87-80d3-4eb5-b9c6-73c43c3a6fca.filesusr.com/ugd/f0b6b3_7310d3c0bf904eb095cf7a2656f0cc37.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/83a1a52e-3b8f-4345-82fa-ff6a954b8092/does_a_honda_eu3000is_have_an_oil_filter.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuduwonifa/78643645462.pdfIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/29569557069.pdfIn PDF document text
    • https://8994dc82-3839-475c-8de5-8afaa5c13229.filesusr.com/ugd/798b5e_6e4c74db4dd94e01a4b6c89a15beeb76.pdf?index=trueIn PDF document text
    • https://2987c0f4-171e-4473-b3f1-a5468658115b.filesusr.com/ugd/75ff8a_75bcd08ba6a4414f8150f24b49bc82c7.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f26d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26D 5444 bytes
SHA-256: 513839389aeeeca2c57dc511b34f0a858c4c5aa2f46cc75081d2332fdda3c61d
font_01_sfnt_off0001050f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050F 11440 bytes
SHA-256: 47437c927089eb2481c3010340e16bd4052028c82526e956f6ca814743002508
font_02_sfnt_off00012be3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BE3 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f