Malicious PDF — malware analysis report

Static analysis result for SHA-256 7da2faafa3a7d510…

MALICIOUS

PDF

70.4 KB Created: 2021-03-19 21:32:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 579fbc1ad994e822c4390f91bf199e2c SHA-1: 5ccee8d45358909e9588945f8c53a1a14f38e54d SHA-256: 7da2faafa3a7d510ce447c4e54981ba8edb5632bc8ececeb96ee9bf4c9fd4b8c
186 Risk Score

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 0.9996

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://jacksth.ru/123?utm_term=lagu+bidadari+tak+bersayap+cover+rock PDF link annotation
    • https://cdn.sqhk.co/kidurukazag/ifjcjad/missiles_definition_simple.pdfIn PDF document text
    • https://cdn.sqhk.co/mofijovelu/hahcBTJ/34936145226.pdfIn PDF document text
    • https://cdn.sqhk.co/jakufomego/Pjhazp1/ponuwukanetitelugoxinog.pdfIn PDF document text
    • https://sixuvowapunara.weebly.com/uploads/1/3/0/7/130738553/a2b9e.pdfIn PDF document text
    • https://cdn.sqhk.co/kibedutej/hhEidie/horse_colouring_book_uk.pdfIn PDF document text
    • http://powutoke.22web.org/photography_barbara_london.pdfIn PDF document text
    • https://wugumura.weebly.com/uploads/1/3/4/6/134601103/6b9fdcaa0295.pdfIn PDF document text
    • https://xugilatopuke.weebly.com/uploads/1/3/4/7/134746985/8088785.pdfIn PDF document text
    • https://cdn.sqhk.co/tajiwikiter/Lb9aXgd/zombs_royale._io_unblocked_66.pdfIn PDF document text
    • https://befufagu.weebly.com/uploads/1/3/1/3/131384284/1118953.pdfIn PDF document text
    • https://bexubefobex.weebly.com/uploads/1/3/4/4/134476762/vineg.pdfIn PDF document text
    • https://cdn.sqhk.co/lomasamube/6jeidpf/flight_connections_worldwide_flight_route_maps.pdfIn PDF document text
    • https://cdn.sqhk.co/rifokinimito/WjgDhu2/11967364000.pdfIn PDF document text
    • https://cdn.sqhk.co/wiwevini/djjjeP2/multiplication_tables_1-_12_printable_worksheets_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jaxesabi/briggs_and_stratton_450e_parts_manual.pdfIn PDF document text
    • http://retelikejajego.rf.gd/criminal_psychology_books_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawexawinogad/avastin_confirmation_of_infusion_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c00d337a-01e9-4623-946e-58dbccd45d26/why_wont_my_ryobi_electric_mower_start.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddbcc9d2-f091-4909-bca6-09a6e01a9ddb/99_names_of_allah_song_by_atif_aslam_download.pdfIn PDF document text
    • http://dupevinituz.epizy.com/hardware_design_engineer_interview_questions_and_answers.pdfIn PDF document text
    • http://wasofiwomorap.epizy.com/bihar_board_10th_result_2020.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_off0000c97c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC97C 5292 bytes
SHA-256: 0a5436cd93985c9f0b359914f631cbd882999ac1f4a50c76f6ec68e6fce66dcf
font_01_sfnt_off0000db9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9C 10024 bytes
SHA-256: f6d8310dbf4d50f24b956c18c2e0af28b9a3859ecf752c3f930250c89b277ba5
font_02_sfnt_off0000fdff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFF 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f