Malicious PDF — malware analysis report

Static analysis result for SHA-256 e49e3b93e79feca9…

MALICIOUS

PDF

84.7 KB Created: 2021-03-24 15:48:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: e54f34c13cfa22f9922018686201bde6 SHA-1: d40e9963c8d4ac19fef605de9af84067f9c199e6 SHA-256: e49e3b93e79feca9e028499da88c14b53053f4c5ab5d87b1378c8482e88e0c6a
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a significant number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. One of the extracted URLs, https://jacksth.ru/strik?utm_term=jlab+go+air+left+earbud+not+pairing, is likely part of this malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://jacksth.ru/strik?utm_term=jlab+go+air+left+earbud+not+pairing PDF link annotation
    • https://wusitezuredov.weebly.com/uploads/1/3/5/3/135314125/8b0ea42.pdfIn PDF document text
    • https://kavekoda.weebly.com/uploads/1/3/5/3/135326791/7602408.pdfIn PDF document text
    • https://nogapixefakul.weebly.com/uploads/1/3/4/5/134590999/fuzitebopodil-wugovijowusonar-nivoru.pdfIn PDF document text
    • https://zelekunidos.weebly.com/uploads/1/3/2/6/132682808/4418614.pdfIn PDF document text
    • https://nolujamikudaze.weebly.com/uploads/1/3/4/8/134868466/lujum_bexukijopere_pidapuwatun_dejatubirosalek.pdfIn PDF document text
    • https://cdn.sqhk.co/zerumowo/hHheoji/vozavodujor.pdfIn PDF document text
    • https://radamokugek.weebly.com/uploads/1/3/2/6/132696621/zorim.pdfIn PDF document text
    • https://parafobosa.weebly.com/uploads/1/3/1/8/131857791/miterubatutamedefiwi.pdfIn PDF document text
    • https://kokazokurazafan.weebly.com/uploads/1/3/5/3/135348127/3fe94df6c9c0.pdfIn PDF document text
    • https://cdn.sqhk.co/jowowibow/h1Otii1/buwajet.pdfIn PDF document text
    • https://cdn.sqhk.co/dokukavifig/GLy00ic/rawekafodugoxogadetopisiv.pdfIn PDF document text
    • https://cdn.sqhk.co/jekunesoru/lhfwhiG/dujidaxikokubov.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/a593ee90-1622-4f5e-9e2c-488faf044b4e/why_riba_is_prohibited_in_islam_and_what_are_the_rationale_for_riba_prohibition.pdfIn PDF document text
    • https://1a6defe7-92a0-4357-8a70-d3bce85d30c9.filesusr.com/ugd/385065_1f0ad5b791954a5787fce76f4dc55947.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c011c49e-c76c-4840-8fd1-794a1f1b754c/why_is_my_hisense_air_conditioner_not_cooling.pdfIn PDF document text
    • https://dc010c70-835d-4b56-8cb0-1e1bda7cab64.filesusr.com/ugd/fb576b_61798866bd6b4e07966e7436005d7b63.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/neporezofov/ruzoxovuwi.pdfIn PDF document text
    • https://s3.amazonaws.com/fedure/13652069340.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10a1b321-d2f4-4a1c-a41e-2689fe250a44/silence_becca_fitzpatrick_plot.pdfIn PDF document text
    • https://7e005a1c-fb68-43c1-af83-b854b6a2d282.filesusr.com/ugd/dcfb95_cc9a3987c0ef4734b86811d8c480cd12.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bogeguva/35755764875.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b122f6fa-ee23-4552-9962-a5f85efcbe92/resofomixodudodalalevigo.pdfIn PDF document text
    • https://77bac38d-831a-46d6-8f22-d7743fcadc58.filesusr.com/ugd/5b9a87_0d8cfc7742824776820112267eb60922.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_off00010ba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA3 5160 bytes
SHA-256: 7ac00479e42e18aede0cb55aa64c1978f5cde7d75d49ff9aec043ec3dd5e68cf
font_01_sfnt_off00011d43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D43 11708 bytes
SHA-256: 396c7002fb09fc9077d37702373943b110626ebc2428c52d6c2eb166b64a9fb8