Malicious PDF — malware analysis report

Static analysis result for SHA-256 757b3af103dfe650…

MALICIOUS

PDF

81.7 KB Created: 2021-03-24 10:41:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: d1c5e2f36a8aff4a90326d5e46868da6 SHA-1: 1909277fb787e59e48b959e66d03f80dab3cab2e SHA-256: 757b3af103dfe650bb809e2dea055e9c8e91667773f322dd3c600a774ad20f2b
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a spearphishing attachment used to redirect victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jumiwimov.ru/strik?utm_term=how+to+do+an+s+curl+hairstyle PDF link annotation
    • https://rafinavogeseb.weebly.com/uploads/1/3/5/9/135987446/wawezupidepim-zanolalorepesit.pdfIn PDF document text
    • https://gapivawaki.weebly.com/uploads/1/3/1/8/131857152/702dba5.pdfIn PDF document text
    • http://wojurimaxab.mywebcommunity.org/causes_of_internet_addiction.pdfIn PDF document text
    • http://bubuwem.iblogger.org/sozexasevifofobaxadopubi.pdfIn PDF document text
    • https://lodavoxi.weebly.com/uploads/1/3/4/5/134505118/rufemekinugil.pdfIn PDF document text
    • https://pasetesosetoje.weebly.com/uploads/1/3/0/7/130775590/5731250.pdfIn PDF document text
    • https://woxumonukoke.weebly.com/uploads/1/3/6/0/136090180/pisubinasafixubar.pdfIn PDF document text
    • https://puxalumanog.weebly.com/uploads/1/3/4/6/134648941/kiwusejanave-siwavofifok.pdfIn PDF document text
    • https://pugiputofal.weebly.com/uploads/1/3/4/7/134740318/fetirugoja.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee995288-dda0-4bd7-b4be-b85a04e75093/70641828179.pdfIn PDF document text
    • http://xelopin.epizy.com/36068153357.pdfIn PDF document text
    • http://dizoterimivitap.rf.gd/how_to_become_a_paramedic_medic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b85bd822-1f55-495f-99a6-1d8642bcb21e/jolar.pdfIn PDF document text
    • http://potovoz.rf.gd/vatuf.pdfIn PDF document text
    • http://nozuwodapa.epizy.com/kagodoto.pdfIn PDF document text
    • http://namajuve.epizy.com/49689678407.pdfIn PDF document text
    • http://nitubak.atwebpages.com/pazazenok.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C6 5180 bytes
SHA-256: af8e4527d3d3466056f9c625c3a08390d59a8013c71875499c2c4b48b360fedf
font_01_sfnt_off00010262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10262 6524 bytes
SHA-256: 20a7a01ffe30c8e9e47dabcde25ce918e087158d1bbaf66c2d7c3651539f3e92
font_02_sfnt_off00011385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11385 11080 bytes
SHA-256: 0da52ae2cbc47e69eda0f4cc5866ce7a6d7a549b8e5b1f19bb5156db3e55bfaa

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