Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d98d3edf58c644f…

MALICIOUS

PDF

79.1 KB Created: 2021-05-02 03:41:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 0dbba552542efa59709db48966eccf05 SHA-1: def7f1cabd5156c690095f533a60f81c7630a607 SHA-256: 2d98d3edf58c644f6697ccc3e85834c3f8f934de2b617681950901b30c066e3e
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 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/strik?utm_term=web+service+api+types PDF link annotation
    • https://cdn.sqhk.co/kawonidoza/ja43Qgj/granny_square_blanket_border.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450336/normal_60360ea2b417c.pdfIn PDF document text
    • https://cdn.sqhk.co/dabozijide/aE2G6jF/rekumixojisefawa.pdfIn PDF document text
    • https://nigizamizu.weebly.com/uploads/1/3/4/3/134319440/12b833d22.pdfIn PDF document text
    • https://mutakisutuw.weebly.com/uploads/1/3/4/7/134768563/tesozosubi.pdfIn PDF document text
    • https://pipamoximiketo.weebly.com/uploads/1/3/0/9/130969724/1536106.pdfIn PDF document text
    • https://sivabujik.weebly.com/uploads/1/3/4/0/134017760/puzoleresevevu.pdfIn PDF document text
    • https://cdn.sqhk.co/tumitibira/ggo7icx/fallout_board_game_card_library.pdfIn PDF document text
    • https://rofofomigedug.weebly.com/uploads/1/3/4/4/134486696/8784866.pdfIn PDF document text
    • https://jemogofeti.weebly.com/uploads/1/3/4/0/134042608/8011271.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402289/normal_60450975e35be.pdfIn PDF document text
    • https://cdn.sqhk.co/tezofugowura/iTidjdp/space_unlimited_compilation.pdfIn PDF document text
    • https://zibozofos.weebly.com/uploads/1/3/4/8/134896422/2c7cfad.pdfIn PDF document text
    • https://bewotenugajuvu.weebly.com/uploads/1/3/2/6/132695730/xusuf.pdfIn PDF document text
    • https://cdn.sqhk.co/murafabu/iejepDR/the_divergent_series_allegiant_book.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a867a740-3546-49c9-bb92-c76f735cad7e.filesusr.com/ugd/c312ff_57b7c13a24974850b8546c26d58ff40c.pdf?index=trueIn PDF document text
    • https://40052bae-d6b0-4be3-9c84-96956a804c69.filesusr.com/ugd/32907c_1baacd319c904e00be095d8612062354.pdf?index=trueIn PDF document text
    • https://f62823ea-e863-4eb7-bd7c-e3bac0139ff1.filesusr.com/ugd/8c639a_c4a9c9a7905442b086207fc2473673fb.pdf?index=trueIn PDF document text
    • https://7c5e2310-e79b-429e-9f4a-70471a43dcce.filesusr.com/ugd/8ec1ef_4d852a53902e479d85cfb1e077844e42.pdf?index=trueIn PDF document text
    • https://a694a867-b0fa-45cd-b082-7f9abf80b1a7.filesusr.com/ugd/430cb2_1df716a9c5ba43e2aacc4657c82ca2ff.pdf?index=trueIn PDF document text
    • https://4edd92ed-4e96-4c3d-a837-a16c7246ae9e.filesusr.com/ugd/7c3149_f7d19c85f08c4b7e906fc0bef672b466.pdf?index=trueIn 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_off0000f96c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96C 5212 bytes
SHA-256: 705f21d5d01c30231039540bc4bfd714d2686dd18c7cacc9f235cd28127cc403
font_01_sfnt_off00010b49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B49 10616 bytes
SHA-256: 7d603dd90fc423588cad7ff328d8529d7f33da527245eda223137d3d68278b70