Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c1169abcd32e6ec…

MALICIOUS

PDF

76.1 KB Created: 2021-06-12 11:00:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: ca583f4ac6d5bbc4b34a9b77d461d75b SHA-1: 53960d21e3da567c56101b7cd7ec8684746c2a65 SHA-256: 9c1169abcd32e6ecace49083aaa7f678c8af1bd48d27634241c0be5189ec429f
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation scheme. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The embedded URLs suggest a redirection to potentially malicious content or further phishing attempts.

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://laborke.ru/pbw?utm_term=dragon+ball+fighterz+official+tier+list PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4499972/normal_60065c8d59544.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501962/normal_602d6a4709997.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373508/normal_606e1f3186e50.pdfIn PDF document text
    • https://wopuwidutava.weebly.com/uploads/1/3/5/3/135322166/5856899.pdfIn PDF document text
    • https://bifuvabomefu.weebly.com/uploads/1/3/0/8/130814245/vobewopawupo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383916/normal_605daca82de86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366008/normal_6037b25c03a2b.pdfIn PDF document text
    • https://vominitaxa.weebly.com/uploads/1/3/4/6/134677623/7430316.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413475/normal_604cee1a1e5d1.pdfIn PDF document text
    • https://tedibijufu.weebly.com/uploads/1/3/4/6/134678634/9e66bab5367224b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446784/normal_601f604b1934e.pdfIn PDF document text
    • https://gewuzonaxos.weebly.com/uploads/1/3/4/7/134714103/baa35b6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448750/normal_5ff936d110666.pdfIn PDF document text
    • https://mokapojigum.weebly.com/uploads/1/3/4/6/134690111/bca24019bb5.pdfIn PDF document text
    • https://duzonaxur.weebly.com/uploads/1/3/4/0/134012347/6479457.pdfIn PDF document text
    • https://tetomorefaboma.weebly.com/uploads/1/3/1/3/131384600/9b655c20fad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://newubotadov.pbworks.com/w/file/fetch/144545190/thy_word_is_a_lamp_unto_my_feet_piano_sheet_music_free.pdfIn PDF document text
    • http://jesababa.pbworks.com/f/how_many_combinations_with_5_numbers_1-45.pdfIn PDF document text
    • http://pafesudive.pbworks.com/f/need_for_speed_most_wanted_windows.pdfIn PDF document text
    • http://wibajeku.pbworks.com/f/dino_run_hacked_unblocked.pdfIn PDF document text
    • http://wukexav.pbworks.com/f/learning_to_die_in_the_anthropocene_book.pdfIn PDF document text
    • http://jujirafamena.pbworks.com/w/file/fetch/144815580/acrobat_reader_dc_2020_patch.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_off0000eacb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACB 5332 bytes
SHA-256: 6eb17eccbbaba3e83a7319e118d75805b1775408475a94d1367dee2886c5238c
font_01_sfnt_off0000fcfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFC 10532 bytes
SHA-256: 2d283f20c7c52cd34e5892ea2f5618c34e4bbf38238ab735243c491ec68beb33