Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1b95694b4e6a2b2…

MALICIOUS

PDF

84.4 KB Created: 2021-04-04 05:18:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 8ebf819641fa6c3883460159b6b77842 SHA-1: 8559e316bfdb118914461b8de03e10c270e82953 SHA-256: d1b95694b4e6a2b266c5bf7ef5c550036f73125bf2a5d3a119c28aaa0d1fada3
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The document body, though partially corrupted, suggests a lure related to router setup. The presence of PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, along with ClamAV's detection of 'Pdf.Phishing.Trojan', strongly suggests a phishing or malware distribution campaign. No scripts were extracted, but the document's structure and embedded links are indicative of malicious intent.

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://mezovuduw.ru/strik?utm_term=how+to+setup+ac1200+router PDF link annotation
    • https://xororawezajeber.weebly.com/uploads/1/3/5/3/135338150/950ee.pdfIn PDF document text
    • https://paxuxitusokewu.weebly.com/uploads/1/3/1/3/131380341/watixepoxamaxa.pdfIn PDF document text
    • https://cdn.sqhk.co/zogobadakedu/gjggyje/descargar_ricky_carmichael_s_motocross_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/wobuwozavenu/shghiig/best_quotes_and_captions.pdfIn PDF document text
    • https://cdn.sqhk.co/nulogoxeja/rGiciPk/kick_the_buddy_apk_android_oyun_club.pdfIn PDF document text
    • https://komijeji.weebly.com/uploads/1/3/1/6/131606126/1638311.pdfIn PDF document text
    • https://judexesadizit.weebly.com/uploads/1/3/0/7/130738912/dd91a18e.pdfIn PDF document text
    • https://cdn.sqhk.co/futogifoku/ujaVjfU/beard_trimmer_with_vacuum_walmart.pdfIn PDF document text
    • https://nibuwoxemunovox.weebly.com/uploads/1/3/4/7/134714338/vazumo-semelorad-wefufi-senem.pdfIn PDF document text
    • http://rekatilugo.iblogger.org/charles_dickens_american_notes.pdfIn PDF document text
    • https://luzidasagozoro.weebly.com/uploads/1/3/4/3/134319964/waline_gemafepari_vikatapodamo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://botefopidavowod.rf.gd/biochemistry_of_cell_notes.pdfIn PDF document text
    • http://xumusemowujev.epizy.com/kofuwikalix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7eae66c5-e91d-4184-9955-4b33a5156a23/66912700803.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6b19ba3-c0b8-432a-a552-f55251becfd7/warerivarukaleg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79478846-801f-4306-b7b1-25f575646830/gawejirozewolobewodevul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b112d39-27c3-48c3-85fc-7ab1d8aea0b9/60843916469.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9b74b3d-7e1c-4658-a9d2-73b69298dbd0/hp_deskjet_ink_advantage_2545_all-in-one_printer_wireless_connection.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4664cf0c-9068-4f45-9e8c-a4f7b3e4b309/6243775789.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79ce3ab9-d723-4f2b-8eba-43f8104d4ee1/grobs_basic_electronics_12e_answer_key.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_off00010d14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D14 5272 bytes
SHA-256: 80e79cf0763fb653688c04d5ba33b010b3edacf86b2cf041ea5f8a213be8bfb9
font_01_sfnt_off00011f28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F28 10848 bytes
SHA-256: 84a68cd2ae9777ce9ce5c738ee7f4dff76b94065dc0ea5005f3344c0eb4e6d8e