Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7846d7838e374fc…

MALICIOUS

PDF

81.6 KB Created: 2021-02-13 22:42:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: bb03472df7b07dc88c6760b45e4ef8cb SHA-1: 231e2cb6c6e26d786c8554d833ad96f513d8b061 SHA-256: c7846d7838e374fcc8d6f9d5ab8f569a4dfade7c8e4245ed6e43005a5f7b88c3
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many of which point to external PDFs hosted on disposable domains, indicative of a link farm or SEO manipulation tactic. One critical heuristic identified links to known malicious redirector infrastructure, and another flagged the PDF as a link farm on disposable hosting. ClamAV also detected the file as Pdf.Phishing.Trojan.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/aws?utm_term=biomedical+waste+disposal+methods+pdf In PDF document text
    • https://cdn.sqhk.co/pozuwifofub/iY3Bxha/halloween_costumes_adults_diy.pdfIn PDF document text
    • https://zifatajute.weebly.com/uploads/1/3/1/4/131438038/soduvuxukagaju.pdfIn PDF document text
    • https://cdn.sqhk.co/pobopuwubox/egeVhgp/best_psx_emulator_for_windows_7_64-_bit.pdfIn PDF document text
    • https://cdn.sqhk.co/vesagivara/O5LWxjh/14430017578.pdfIn PDF document text
    • https://cdn.sqhk.co/xojelumegasi/5jtFhbc/translate_from_spanish_to_italian_language.pdfIn PDF document text
    • http://stakingyfi.com/272078210221lw4q.pdfIn PDF document text
    • http://infonewsuk.site/call_of_duty_1_game_trainer71h1w.pdfIn PDF document text
    • http://avtovishki-msk.ru/6337988539c0a2t.pdfIn PDF document text
    • https://cdn.sqhk.co/rokajoten/Hget5Cz/rocky_mountain_high_music_and_lyrics.pdfIn PDF document text
    • https://cdn.sqhk.co/tomubozes/jJhihgG/battlehand_heroes_guide.pdfIn PDF document text
    • http://avtoshkola-region26.ru/christmas_lights_home_decorating_ideas6vxlw.pdfIn PDF document text
    • https://cdn.sqhk.co/nusideja/ojhdhjb/dubewapujenolavalu.pdfIn PDF document text
    • https://tabogivazosepa.weebly.com/uploads/1/3/1/8/131871767/neropunokaladugesew.pdfIn PDF document text
    • https://cdn.sqhk.co/ketejeti/aMbij2a/89220190574.pdfIn PDF document text
    • https://todulatewex.weebly.com/uploads/1/3/0/7/130738789/vigixidol.pdfIn PDF document text
    • http://srakan.space/91917708242jg9nn.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwefuxab/DolRfhh/map_of_uk_counties_and_main_cities.pdfIn PDF document text
    • https://mejepizejuv.weebly.com/uploads/1/3/4/5/134528376/jepizukofur.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
    • http://wofufudemito.epizy.com/akeeba_backup_joomla_2._5.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_off0000f59f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59F 5120 bytes
SHA-256: 2460c2ddeabc52fa60ad7acc57cb1522d2da687c9a579aad6a1b9df59766afeb
font_01_sfnt_off0001071f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071F 10436 bytes
SHA-256: 25257e1749e301f4c115da9234d8e68890fb314be6bfa6bb1986b007c5fb9734
font_02_sfnt_off00012abe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ABE 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333