Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd50e8721626b87e…

MALICIOUS

PDF

88.4 KB Created: 2021-03-30 14:51:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 4b4bd7f2f22b1ee7b38ec25409a6fdbb SHA-1: b4765e3e56fea91d69b47ef9cc78ae568d5e0799 SHA-256: dd50e8721626b87eb39bd03f2acd9e900290a31563db3da13d6343dc8fad5344
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary purpose appears to be directing users to numerous websites, likely for SEO spam or to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://xajibur.ru/wix?keyword=depstech+wf010%252F020+manual PDF link annotation
    • https://nilowebun.weebly.com/uploads/1/3/4/7/134751503/jikeze.pdfIn PDF document text
    • http://wisatemubudu.medianewsonline.com/33156158944.pdfIn PDF document text
    • https://girawosanisab.weebly.com/uploads/1/3/0/7/130740609/2983091.pdfIn PDF document text
    • https://fosovumukudire.weebly.com/uploads/1/3/4/2/134235423/venozolaf.pdfIn PDF document text
    • http://kavuxolabazili.iblogger.org/approaches_to_financial_management.pdfIn PDF document text
    • https://foluxafan.weebly.com/uploads/1/3/5/3/135397430/7490315.pdfIn PDF document text
    • http://tifiwijewek.iblogger.org/basics_of_electronics_free_download.pdfIn PDF document text
    • http://kevarusakoko.mypressonline.com/dememazafusife.pdfIn PDF document text
    • https://navanelesud.weebly.com/uploads/1/3/0/9/130969746/961499.pdfIn PDF document text
    • https://nutovavodus.weebly.com/uploads/1/3/4/0/134012609/sepugawozit-rakelozu-fenesexog-rabifimabomi.pdfIn PDF document text
    • https://nevuvipegigi.weebly.com/uploads/1/3/4/5/134589722/lufeg_jomozemusukib_gukanusitale_vitar.pdfIn PDF document text
    • https://demijogukif.weebly.com/uploads/1/3/1/3/131382539/gerewafarivige.pdfIn PDF document text
    • https://xajakubadom.weebly.com/uploads/1/3/0/8/130874473/parinixoperebe-jazev-bazopexafo-zitup.pdfIn PDF document text
    • https://fipufiradak.weebly.com/uploads/1/3/0/8/130813779/fiduzidikedi_mezivixutasi.pdfIn PDF document text
    • https://sulunekuzesafap.weebly.com/uploads/1/3/1/4/131406846/kojojurogofixef.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/fipijife/84373872090.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/fisher__paykel_dishwasher_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/nuvukivaxiren/9277783340.pdfIn PDF document text
    • http://rufupiz.rf.gd/what_is_arsenic_used_for.pdfIn PDF document text
    • http://koriwironawuva.myartsonline.com/ken_blanchard_books.pdfIn PDF document text
    • http://fuvamawijivef.atwebpages.com/momusa.pdfIn PDF document text
    • http://wexugemo.epizy.com/54720396869.pdfIn PDF document text
    • https://s3.amazonaws.com/tanikanaw/sepexikavejobiduve.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/setting_up_my_honeywell_wifi_thermostat.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B94 2996 bytes
SHA-256: 79a641d0ba14e1b7a2478496c6fc2a704dfa61ade168504e014b8094a74e8969
font_01_sfnt_off00011651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11651 5612 bytes
SHA-256: 1c25fbf1c0951398b4b9a02eaf0bc389f357b3ae17387673b3f7546f8af987c8
font_02_sfnt_off0001296d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1296D 12456 bytes
SHA-256: f7d231b5a9d0217603b98c59a593eb758ace50be33cdc2d47267803c931554bf