Malicious PDF — malware analysis report

Static analysis result for SHA-256 668283537b619ad2…

MALICIOUS

PDF

77.3 KB Created: 2021-04-24 06:55:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 58537e0a6791f6eab4ed25864a736453 SHA-1: 39336c44a6d44dce80b1bc95486ad42462f7984d SHA-256: 668283537b619ad299dfa7b2b003bab34d6a02fecba3e0871d50f0cbb1436c6d
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains a large number of external links, many of which point to disposable domains and are likely part of a link farm designed to manipulate search engine results. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs suggest an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9894

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://ponafet.ru/strik?utm_term=total+gym+xls+accessories+ebay PDF link annotation
    • http://mybiol.site/house-tree-person_test_examplesfn2eu.pdfIn PDF document text
    • http://tumuduwaju.mypressonline.com/babylon_mystery_religion_ancient_modern.pdfIn PDF document text
    • https://sarununow.weebly.com/uploads/1/3/4/3/134366188/sijivixexuwojeg.pdfIn PDF document text
    • https://cdn.sqhk.co/rozesivotix/dJThede/84825212973.pdfIn PDF document text
    • https://fakadaro.weebly.com/uploads/1/3/5/9/135961508/423794.pdfIn PDF document text
    • https://kevanosum.weebly.com/uploads/1/3/0/9/130968994/3298664.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvexajamu/NvNhhgd/special_rambo_game_download_pc.pdfIn PDF document text
    • http://dokukuke.mypressonline.com/15337869242.pdfIn PDF document text
    • https://cdn.sqhk.co/motuwezelu/f7jc8GV/31530576764.pdfIn PDF document text
    • https://pogixovupo.weebly.com/uploads/1/3/4/6/134690118/zetewipasek.pdfIn PDF document text
    • https://cdn.sqhk.co/gixekoji/Ggojad4/datijilorolotoge.pdfIn PDF document text
    • https://cdn.sqhk.co/famagafe/bKhfggw/ted_talks_podcast_npr.pdfIn PDF document text
    • https://tumunuwixa.weebly.com/uploads/1/3/1/3/131384432/a9efe879c12c.pdfIn PDF document text
    • http://help-bluebadgecenter.com/gukixadaq008f.pdfIn PDF document text
    • https://fapixuguxoga.weebly.com/uploads/1/3/1/0/131070829/juweboxukif-komim-sepimofonured-lusazufuwafepox.pdfIn PDF document text
    • https://jamakebowixon.weebly.com/uploads/1/3/4/4/134477175/mepafegedod_kakuposupem_jaratobef_lavizodevar.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/b27fda3d-3525-418a-b5aa-08a2ca095b57/46766873634.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8111ab4-77c7-46ec-979a-b3a4667e789e/22532756907.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/363a44e9-6642-4343-9f22-f53bb61f4046/gedat.pdfIn 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_off0000f73c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73C 5380 bytes
SHA-256: 61fb260ede2705c6cdca905129b12aa9a45ee617140580cf20e5d0a0800e9df6
font_01_sfnt_off00010986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10986 10908 bytes
SHA-256: f7f8cf3279093e6065c61af603eed9396337a73a6b31c2373e6c818c4b7f6af0

Open this report in the interactive analyzer, or submit your own file for analysis.