Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a13a62b24188432…

MALICIOUS

PDF

74.3 KB Created: 2021-05-01 16:44:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 7dcdfec4e21c7037323363792cc4256d SHA-1: 10040702da0236013d2da5fceb99702775f20d00 SHA-256: 8a13a62b24188432e367190096b982ec700b03c13022d3a5e86d074db8d4cb30
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://soxebez.ru/strik?utm_term=what+reading+level+is+junie+b+jones+and+the+stupid+smelly+bus PDF link annotation
    • https://cdn.sqhk.co/gotofebelu/ahaNGic/mini_bowling_ball_kerosene_lighter.pdfIn PDF document text
    • https://cdn.sqhk.co/raxuzuvuluf/x5ECegf/45139528930.pdfIn PDF document text
    • https://cdn.sqhk.co/podoxato/X5xK5hi/game_world_building_craft_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/mixaluwekitu/VOXhg48/formula_acceleration_due_to_gravity.pdfIn PDF document text
    • http://bonetanoli.22web.org/trumpet_voluntary_brass_quintet.pdfIn PDF document text
    • https://cdn.sqhk.co/lorotukogof/ohiyhfy/pressure_washer_extension_wand_parts.pdfIn PDF document text
    • https://cdn.sqhk.co/kopuzeginev/HXF1hhZ/cowboy_boots_price.pdfIn PDF document text
    • https://cdn.sqhk.co/gazegarov/eMibjbe/uncertainty_principle_explained_youtube.pdfIn PDF document text
    • http://mekuwomusaxonod.22web.org/74417173118.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/fb46fb37-4fa9-4fac-9248-6455c0b223f6/how_does_a_bill_becomes_a_law_philippines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3801174b-4e0e-4803-93b5-9a3147dfb30e/45660990716.pdfIn PDF document text
    • https://e25b7b56-d8f7-44cb-9276-56428e53d1cc.filesusr.com/ugd/63f3e8_b980f92e65e146a791c0ac2539f4486c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/52fcf05b-08ca-4c60-8e1e-cc43ebbeb80c/42631529525.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb5aa37d-c361-4ece-9b12-6714d48985f4/twilight_2012_full_movie_in_hindi_download_480p_filmywap.pdfIn PDF document text
    • https://0ed30ddb-3df1-4505-9e4e-3e87fc6d20ea.filesusr.com/ugd/f043c1_8a491bfbc34d442f8ca92333af50d1d7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/787563e2-2a4a-4996-9be3-a33438fb88c1/lg_47ln5400_parts.pdfIn PDF document text
    • http://ratotepuno.rf.gd/what_size_is_a_10_30_in_jeans.pdfIn PDF document text
    • https://562c2315-396f-49d1-9e45-1236e049cb13.filesusr.com/ugd/ec0012_0b944e9ce16245f9876f8c99fd2d3478.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/46dbe025-ee1c-49a3-a04d-c55076ca612d/goguzelugisuvunubarato.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_off0000e0fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FE 5764 bytes
SHA-256: 854716db71a1a9b56ee90a38bf09f8658354bb15d3a158edec6bd00969f8d4a8
font_01_sfnt_off0000f48c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48C 10852 bytes
SHA-256: 3f7624bebfd31729d2bdaa2291811950c2e6e7a7b00cd03252f497e37972a96c

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