Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5949ac4a9588cd6…

MALICIOUS

PDF

83.8 KB Created: 2021-03-16 09:55:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 6431ecee332279e79b6d239df9262602 SHA-1: 8003785a647a31dd3a49b01aedb75ef3d3c8b80f SHA-256: b5949ac4a9588cd63d5d4e969de8f5119dfb2707c43a980abf66c3d1eb6a1ebc
244 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many of which are hosted on disposable domains or known malicious redirectors, indicating a link farm for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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
  • 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://dafemum.ru/award?keyword=interview+job+questions+and+answers+pdf In PDF document text
    • https://cdn.sqhk.co/wugeguxu/GCjaUib/programming_hub_learn_to_code_review.pdfIn PDF document text
    • https://cdn.sqhk.co/vijukifezu/digjiaD/pinball_fx3_sorcerer_s_lair_skill_shot.pdfIn PDF document text
    • https://cdn.sqhk.co/dajebala/gheevfV/closest_train_station_to_silverstone_race_track.pdfIn PDF document text
    • https://cdn.sqhk.co/tebolugex/geQfgiy/74852759334.pdfIn PDF document text
    • https://folenepawesig.weebly.com/uploads/1/3/2/6/132680852/6803357.pdfIn PDF document text
    • https://zobovakobazazu.weebly.com/uploads/1/3/4/3/134319401/gonal.pdfIn PDF document text
    • https://kaledawuvilef.weebly.com/uploads/1/3/4/7/134727412/ruvipemovosox_mewaj.pdfIn PDF document text
    • https://cdn.sqhk.co/virurewev/jaxhggi/64275187024.pdfIn PDF document text
    • https://jabifuvos.weebly.com/uploads/1/3/1/0/131070291/88baf8f4dae.pdfIn PDF document text
    • https://cdn.sqhk.co/dopebuxoz/jhfgdOM/telawuzurulejexudamog.pdfIn PDF document text
    • https://cdn.sqhk.co/rumobotituda/cgjIjdO/apa_citation_style_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/gasariba/hfhbggg/emtek_modern_brass_keypad_deadbolt.pdfIn PDF document text
    • http://rozel.ru/percy_jackson_first_book_in_seriespldm8.pdfIn PDF document text
    • http://gdztut.com/1065888696fq9rg.pdfIn PDF document text
    • https://cdn.sqhk.co/nomitusibop/jfkG5hf/zujikugufuboxenifokazax.pdfIn PDF document text
    • http://optarfes.com/one_way_anova_testi_nedirajc6b.pdfIn PDF document text
    • https://cdn.sqhk.co/banijuwa/arijigz/free_download_call_of_duty_mobile_ios.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fuvituze.epizy.com/matlab_legend_latex.pdfIn PDF document text
    • https://e2604e0b-f95a-4acb-b53f-a7db3827b2a1.filesusr.com/ugd/225520_620118c85598420e90cbfc8bcc8efb6a.pdf?index=trueIn PDF document text
    • https://19e6fc83-c281-4d06-93fd-e8b16a02b90a.filesusr.com/ugd/ce5d00_01eb8aef897e42cd9e602d7c996ce54a.pdf?index=trueIn PDF document text
    • http://wigezenefibi.epizy.com/velin.pdfIn PDF document text
    • http://jelugubafegoj.rf.gd/web_development_tutorialspoint.pdfIn PDF document text
    • https://4bc473c2-84d0-4913-8b4e-281bf44fba2e.filesusr.com/ugd/a25dbd_19ded4d5757640ba81a5f46cf739475e.pdf?index=trueIn PDF document text
    • https://97a45c9e-1ab5-462a-bfe2-fded34b9a8b9.filesusr.com/ugd/b50c55_3c5daad03f8741a785b073a08e54bb2c.pdf?index=trueIn PDF document text
    • http://jepafuzezax.epizy.com/char-_broil_performance_series_t36g5_kaufen.pdfIn PDF document text
    • https://22e365c6-0853-42e1-82f8-83473bf9c0bf.filesusr.com/ugd/217d68_a4445e9f81f04ff488451c26d49e1561.pdf?index=trueIn PDF document text
    • http://guradewididexep.epizy.com/bethune_college_merit_list_2019.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_off0000fe6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6F 5432 bytes
SHA-256: b23d2c31f95fb42263f7287eda70339901b9c18b715d4245afd6647ef9305ae3
font_01_sfnt_off00011100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11100 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_02_sfnt_off0001198e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1198E 11416 bytes
SHA-256: e533d70c375d38f682924499f5897c4e0623991a30fa7f8f7dc7a0efcfd6a5d4

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