Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b3563ad9e3c8486…

MALICIOUS

PDF

93.3 KB Created: 2021-04-24 23:36:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 5fd568969798e80f79f3922f1512d212 SHA-1: 7f6aca3f0802a7a83a5baf406714190f8042cffe SHA-256: 3b3563ad9e3c84869c95261677a8c7df4afddf0213ea74e0ed86e854c26fcab7
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan payload. The document contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and a link farm heuristic points towards an attempt to lure users to external sites, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ponafet.ru/strik?utm_term=mechanical+engineering+handbook+mcgill PDF link annotation
    • https://puzerufatuv.weebly.com/uploads/1/3/1/1/131163838/6545647.pdfIn PDF document text
    • https://pizizidoto.weebly.com/uploads/1/3/0/8/130873839/vezabadudutu.pdfIn PDF document text
    • http://kefijor.mygamesonline.org/athlean_x_max_size_reddit.pdfIn PDF document text
    • http://pedugubugof.mywebcommunity.org/mean_median_mode_grouped_data_example.pdfIn PDF document text
    • https://cdn.sqhk.co/xolofiwano/ihxqJOQ/vugokepe.pdfIn PDF document text
    • https://farunekigevizaj.weebly.com/uploads/1/3/5/9/135976182/1572df61.pdfIn PDF document text
    • https://nuniladolu.weebly.com/uploads/1/3/0/7/130775245/lerororewiguk.pdfIn PDF document text
    • http://zogometemo.sportsontheweb.net/calendar_definitivat_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/radofufalam/hf2ihVr/arnold_chiari_malformation_surgery_pictures.pdfIn PDF document text
    • https://vaxatimiroxak.weebly.com/uploads/1/3/4/6/134617636/xosisarafaxu-matejidatixa-latorika.pdfIn PDF document text
    • https://cdn.sqhk.co/ridefapagol/E4hgKUW/best_buy_black_friday_2019_apple_laptop_deals.pdfIn PDF document text
    • https://kalujobad.weebly.com/uploads/1/3/4/3/134390175/mokifedam.pdfIn PDF document text
    • https://vutepunuvo.weebly.com/uploads/1/3/1/6/131637517/furukiwi.pdfIn PDF document text
    • http://toxipoxekej.medianewsonline.com/89785626294.pdfIn PDF document text
    • http://lupelisizi.medianewsonline.com/gefokevit.pdfIn PDF document text
    • http://pimifawimonidij.mywebcommunity.org/dewolubixobujabelo.pdfIn PDF document text
    • http://sotipidikukunow.getenjoyment.net/nijuxutum.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bitenozof.atwebpages.com/kedaxazepajajesogidiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9412f1a-d2a7-4394-a8a8-22662ec46c14/la_crosse_technology_wall_clock_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30ee9be4-1311-4ee0-ba56-cd984b0759e0/what_drinks_does_taco_bell_have.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F67 9676 bytes
SHA-256: ccc6583a9e5a22913399d901aa2759ff8f6ae106c86659796e4e42da438e7f43
font_01_sfnt_off00012f6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F6B 5384 bytes
SHA-256: 903c019565cf5667f250bea089b1dce2ac2873c6dff4b2a37247f834e1dd644d
font_02_sfnt_off00014199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14199 11160 bytes
SHA-256: 4394a54d0fb3773fbafbfd120eb246f1c01ce93639c48c879ea83cb1fd520ab4