Malicious PDF — malware analysis report

Static analysis result for SHA-256 9931314e6c5c7b01…

MALICIOUS

PDF

82.2 KB Created: 2021-04-11 11:28:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 1545e6c63aab49fb5bd82bff0fda57f0 SHA-1: c285839121971ec6d495cc74dc2472cb9e253686 SHA-256: 9931314e6c5c7b012aaf6946a3c7540c60bb09c7627651064bfe6c0d8e1c28c7
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to SEO-optimized PDF hosting sites, suggesting a link farm or phishing lure. The presence of a redirector URL and the ML classifier's high confidence score indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://dugedepap.ru/strik?utm_term=difference+between+reference+and+pointer+javatpoint PDF link annotation
    • https://wipovatoz.weebly.com/uploads/1/3/4/0/134012317/tikurimuxu.pdfIn PDF document text
    • https://cdn.sqhk.co/jejefudebuxi/giMhjii/camera_editing_free.pdfIn PDF document text
    • https://cdn.sqhk.co/zoboxoba/0hahbTe/fimazivuzuxikon.pdfIn PDF document text
    • https://bilokomomaxin.weebly.com/uploads/1/3/5/3/135397692/takokasilivoman.pdfIn PDF document text
    • https://woxogobigevi.weebly.com/uploads/1/3/0/8/130814596/2223954.pdfIn PDF document text
    • https://cdn.sqhk.co/gapobuzijiru/lB65B4J/giwepowafixaxetos.pdfIn PDF document text
    • https://cdn.sqhk.co/xamowizaso/gjTH9ih/play_the_eagles_greatest_hits_on_youtube.pdfIn PDF document text
    • https://nimadelafux.weebly.com/uploads/1/3/2/6/132695392/sojibizolazis-naramusobire-rudubeziv-gorejekowinaro.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/a49f938b-3462-4f01-b489-e26ede7c7f12/what_are_the_types_of_house_wiring.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d053c258-6d09-49aa-8cac-28e5fc091736/lidudadajejedivoregefolo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/632619b5-d8bd-4fd5-9257-1382051cba1f/how_to_use_a_wet_dry_vacuum_cleaner.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5f70081-8684-4c28-a325-5a62071b7403/how_to_learn_computer_basics_in_kannada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f33943b-643b-458a-97ed-b8a8133324ad/42626778080.pdfIn PDF document text
    • https://s3.amazonaws.com/lurutopobi/adform_reporting_api.pdfIn PDF document text
    • https://s3.amazonaws.com/zarusegibitumet/graphic_design_website_free_templates.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/438c5079-4cde-4b7e-9e6d-cddbdaf7472a/gugumafubuxozebutujomipef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30662b6a-da00-4aea-8da4-998b02e7a99c/daxonuzexubozozijulos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b62e55c-b487-45c5-982c-711fd9e15b9f/49100086031.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dccba508-5bae-4596-a0a5-e8c092cafc2c/panasonic_th-42px60u_stand.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CE 5308 bytes
SHA-256: f0eced5a3616ae630e182ebd3ebe7c4f73708015dd2c72adbccb2f92aa0cfd4b
font_01_sfnt_off00011506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11506 11232 bytes
SHA-256: 5b1a25da630a93f8d1026fb82dda2a8aea35c62b29516ab8bfb2c87a37af6975