Malicious PDF — malware analysis report

Static analysis result for SHA-256 b970000f084c3556…

MALICIOUS

PDF

80.0 KB Created: 2021-04-02 04:52:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: b9f1cbf89ca638f67bffcfe1d4d9d898 SHA-1: ebe5f66026036d94d041324e7d008a90e565e84c SHA-256: b970000f084c3556da6d8dd30be10fe6833719c54daa9a9abfac6afba605b7fb
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The presence of a specific search term ('vw service centre bristol') suggests a targeted phishing or social engineering attempt. ML and ClamAV detections confirm the malicious nature of the PDF, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://kuzutuzo.ru/strik?utm_term=vw+service+centre+bristol PDF link annotation
    • https://nixixufusolawig.weebly.com/uploads/1/3/4/8/134882604/bowupovusa_sigijo_tutefexi.pdfIn PDF document text
    • https://serivuzoforin.weebly.com/uploads/1/3/4/3/134334639/3d7af8a772a.pdfIn PDF document text
    • http://uaregroup.com/80790917607emp51.pdfIn PDF document text
    • https://cdn.sqhk.co/tomubozes/jdqzjgk/sandwich_recipes_with_photo_for_free_vegan.pdfIn PDF document text
    • http://wildboost.club/dictionary_of_archaeologyq9h4i.pdfIn PDF document text
    • https://cdn.sqhk.co/rawewosit/iOtNkOH/ramigagixoda.pdfIn PDF document text
    • http://winsl.space/alfred_piano_books_for_adults_all_in_one_level_2dd0aq.pdfIn PDF document text
    • http://d2-club.ru/sofetavidiwed1fo1j.pdfIn PDF document text
    • http://ohota-ribalka.online/idle_train_empire_mod_apk1323d.pdfIn PDF document text
    • http://academic-club.ru/45048088245664jd.pdfIn PDF document text
    • http://olivamebel.com/tata_sky_app_for_androidrb61k.pdfIn PDF document text
    • https://cdn.sqhk.co/tipekafomube/KhhgdLD/60081969167.pdfIn PDF document text
    • https://metifavogogebo.weebly.com/uploads/1/3/4/7/134716609/jolatimafu-zezusowejazoded-jixovafewigo-lexup.pdfIn PDF document text
    • http://detonicufficiale.website/what_is_the_best_computer_for_uni_studentsh0b6p.pdfIn PDF document text
    • https://tupumerar.weebly.com/uploads/1/3/2/6/132695397/wexuweriweg.pdfIn PDF document text
    • http://bonifacy.site/76133573523ck3hn.pdfIn PDF document text
    • https://cdn.sqhk.co/bexoninodag/Bifhjdj/rabulumobebilutubogos.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b81e1767-bb0d-4562-9f98-cfef66859bb1.filesusr.com/ugd/b48b60_24c0fe312ed74c138d18be8ba7debe97.pdf?index=trueIn PDF document text
    • https://64f1e6a9-4530-4009-9f9b-67b91dd69f79.filesusr.com/ugd/76b6de_4152caaba4364ff3a3b8d8e29c916dc0.pdf?index=trueIn PDF document text
    • https://9539e3d7-93ad-434a-85ac-22bd9bdb82bb.filesusr.com/ugd/df7b34_12da98fc150d4f3e8ff91eaec9ca3302.pdf?index=trueIn PDF document text
    • https://6d428a25-da86-44fa-8f13-5b0f09742281.filesusr.com/ugd/3649d2_7edcb6023f36457fa452e645d5ad375b.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_off0000fc0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0F 4840 bytes
SHA-256: eb2b83e9d5310bb140de01d527ebd9a9284e558210b2d3191882036db158ea84
font_01_sfnt_off00010cb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB0 10824 bytes
SHA-256: 94ee9ba69c2e78921540a39cfc168f3ec2aaaed7f59f8b4465ff5f51402b8090