Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ff624393c8d633b…

MALICIOUS

PDF

74.1 KB Created: 2021-04-04 17:46:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: e4858ff1d73ae667dae0c265593cfd44 SHA-1: e34a01669d08a54f564480ab3014f503b8502538 SHA-256: 1ff624393c8d633b3df1ceca100daef63ab6bb4976c31d96f96d81d72203a9c3
186 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, containing numerous external links to various websites, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body, though heavily obfuscated, contains keywords related to 'Biblical hebrew lessons pdf', suggesting a lure to attract unsuspecting users to click on the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xezojetit.ru/award?keyword=biblical+hebrew+lessons+pdf PDF link annotation
    • https://kemavejikokawi.weebly.com/uploads/1/3/2/3/132303077/lofobidazofi_gufivotukavor_bejib.pdfIn PDF document text
    • https://cdn.sqhk.co/dugelabomaw/cW42iix/slater_textbook_answers_chemistry.pdfIn PDF document text
    • https://cdn.sqhk.co/xataruzepape/2gfYjfT/communism_vs_socialism_definition.pdfIn PDF document text
    • https://sazotavivi.weebly.com/uploads/1/3/1/1/131164406/gekevirigatasov_pefitirek.pdfIn PDF document text
    • https://timivoza.weebly.com/uploads/1/3/5/3/135315173/a5aeb93fd1.pdfIn PDF document text
    • https://memugili.weebly.com/uploads/1/3/4/5/134526503/rilapulem-jidoxut-riniwojulaseb-gixomebuten.pdfIn PDF document text
    • https://wisomekusarukit.weebly.com/uploads/1/3/5/3/135384288/vazomavolurofil.pdfIn PDF document text
    • https://wevepuxobufo.weebly.com/uploads/1/3/0/7/130776344/rinaketedig.pdfIn PDF document text
    • https://cdn.sqhk.co/wofazexej/hjzgAoa/bugsy_malone_trailer_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/futevanu/hTijbhd/oregairu_hachiman_and_yukino.pdfIn PDF document text
    • https://juwaxevepatasi.weebly.com/uploads/1/3/0/8/130874094/9436a01a750.pdfIn PDF document text
    • https://faxipanonuk.weebly.com/uploads/1/3/4/3/134352952/4c333626.pdfIn PDF document text
    • https://kujarubokaja.weebly.com/uploads/1/3/4/5/134590089/pijuvipaditevesi.pdfIn PDF document text
    • https://cdn.sqhk.co/pefibovip/idyTYid/xiluvekamevogelu.pdfIn PDF document text
    • https://rimofemosi.weebly.com/uploads/1/3/4/3/134351632/3951382.pdfIn PDF document text
    • https://sejukato.weebly.com/uploads/1/3/4/0/134018084/6c7bf275872d.pdfIn PDF document text
    • https://fumumakol.weebly.com/uploads/1/3/4/0/134017799/f796a.pdfIn PDF document text
    • https://lapulefad.weebly.com/uploads/1/3/2/8/132815180/af04254f.pdfIn PDF document text
    • https://rotarivinevi.weebly.com/uploads/1/3/4/5/134599250/3042038.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a04ad255-06d6-4b17-97e7-91173d300295.filesusr.com/ugd/6864df_03681aa8ecd243ebb440f44daeb733e5.pdf?index=trueIn PDF document text
    • https://fbaba6ab-37cf-477f-82bd-e10a416eccda.filesusr.com/ugd/3c8574_c63540c44c714691af089f9a9ef4bb62.pdf?index=trueIn PDF document text
    • https://79ab8074-8148-4faa-9219-f6cdfa35bc15.filesusr.com/ugd/99e004_c187726491fd4ec38c1375fce5bbad07.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_off0000e337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE337 5524 bytes
SHA-256: 292fb2c5776d558d734150d9f84e1c04fbb5166e97ab9dadf499fc5ab3d25609
font_01_sfnt_off0000f609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF609 10764 bytes
SHA-256: 8016536346e254c3d02f719707063594917a63b42cd8a3e182d7e4ca10edc167