Malicious PDF — malware analysis report

Static analysis result for SHA-256 08247761b429a11b…

MALICIOUS

PDF

96.7 KB Created: 2021-05-10 04:07:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: b6856d54effff3a2e41a9a70c22ab10a SHA-1: 4cbdb25c0dd33835306f67f5eac673155c0fd2c7 SHA-256: 08247761b429a11bde679e739428b25be7dc6f5a87e74ec916dd0f0f03239c8d
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous URLs point towards an attempt to exploit users by directing them to potentially harmful websites.

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://pelibifir.ru/strik?utm_term=el+amor+en+los+tiempos+del+colera+resumen+capitulo+2 PDF link annotation
    • https://cdn.sqhk.co/komagiju/jfhahZE/brain_puzzle_3d_games.pdfIn PDF document text
    • https://cdn.sqhk.co/bexexiku/fgfhcLC/hiatus_kaiyote_nakamarra_sheet_music.pdfIn PDF document text
    • http://apkweb.net/how_to_sell_a_rainbow_vacuum_cleaner64et4.pdfIn PDF document text
    • http://vizionsmc.net/they_that_wait_upon_the_lord_shall_renew_their_strength_picturesqwtb7.pdfIn PDF document text
    • https://cdn.sqhk.co/fobojuwof/SDAjfhi/fodesenavowo.pdfIn PDF document text
    • https://zinexosodolawiw.weebly.com/uploads/1/3/4/2/134235462/c29230c96454a0.pdfIn PDF document text
    • http://neo-tp.ru/1806299676q5m6i.pdfIn PDF document text
    • http://keepmaxi.space/how_to_change_legend_title_in_rqwldp.pdfIn PDF document text
    • https://cdn.sqhk.co/vixukose/ii3ZZ5v/pikekoborivuw.pdfIn PDF document text
    • http://lerob.info/706799381751mxza.pdfIn PDF document text
    • https://cdn.sqhk.co/sugigevapure/0RIheH7/electric_guitar_brands_a-_z.pdfIn PDF document text
    • https://cdn.sqhk.co/kabevapixox/ehfid9K/shell_vacations_club_at_desert_rose_resort.pdfIn PDF document text
    • https://maduzoxunixeg.weebly.com/uploads/1/3/0/7/130775653/vakatuforuripoba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wibukosumasej.rf.gd/update_windows_10_store_manually.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/282e03be-840c-40f6-9756-580ff2eaf4f8/10012886068.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/798f87d1-0c0f-4785-9fc1-22934a57fd29/zevimewakebigaputiteguwo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/541c518b-3764-4a26-b84c-1e0751a0cd9f/what_charities_has_nike_donated_to.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/457fb897-9970-439c-9b6d-b4be24ac3fed/82868834142.pdfIn PDF document text
    • http://potosalusuk.rf.gd/data_science_intern_salary_in_india.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bd5160b-6fcd-4d8f-9107-3aacecb95738/3323511122.pdfIn PDF document text
    • http://saretozegif.rf.gd/93828544858.pdfIn PDF document text
    • http://bosadubarelazu.rf.gd/britax_b_agile_stroller_user_manual.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_off000138f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138F0 5308 bytes
SHA-256: 0336128e84d294ee13dd7d134560d0b03c4c2b51b3ead30812886f72375ee59c
font_01_sfnt_off00014aec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AEC 12528 bytes
SHA-256: c9f9eabda3221597ce79f38fe5ade9edccd1c4b40726399795c83b7fd26b20d7