Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad2ebb86a9d33034…

MALICIOUS

PDF

78.0 KB Created: 2021-04-04 08:21:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8db7f6811511f95095307cd29967df96 SHA-1: 7dfa8e3332cac88840218c79ece6cd5101270244 SHA-256: ad2ebb86a9d330343b7ca73c7b78060e6a58dda2eb361043552f0fff072b7b75
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, pointing to various domains. The primary URL, 'https://gimoguvi.ru/award?keyword=all+animals+names+in+english+with+pictures+pdf', suggests a lure to trick users into visiting potentially malicious sites. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. No scripts were extracted, but the structure and heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gimoguvi.ru/award?keyword=all+animals+names+in+english+with+pictures+pdf
    • http://larediwavokib.iblogger.org/gta_vice_city_cheats_pc_file.pdf
    • https://jitebemaduk.weebly.com/uploads/1/3/4/6/134692965/6071836.pdf
    • https://xegazoniwenopuk.weebly.com/uploads/1/3/6/0/136011370/4610772.pdf
    • http://rikuximuvo.iblogger.org/anti_bullying_policy_workplace_template.pdf
    • https://subusigigug.weebly.com/uploads/1/3/5/3/135316146/8118988.pdf
    • https://retizobokeli.weebly.com/uploads/1/3/1/0/131070240/xonobaga.pdf
    • https://kobizixudowizeb.weebly.com/uploads/1/3/4/4/134402546/8702275.pdf
    • http://ladokewukuman.iblogger.org/22504373075.pdf
    • http://kegitolufisiwa.iblogger.org/one_step_inequality_word_problems_worksheet_6th_grade.pdf
    • https://sewizejego.weebly.com/uploads/1/3/4/6/134679492/jiruv.pdf
    • https://vofovolovun.weebly.com/uploads/1/3/1/4/131483423/39f717bf.pdf
    • https://vefutafefu.weebly.com/uploads/1/3/4/8/134882527/lexupovefos_lozosemegufaj_dorolojaw.pdf
    • https://kaziwudajolegol.weebly.com/uploads/1/3/0/7/130738741/4721401.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://0f4267a5-27df-427f-b7ff-de3c6d4a4cd0.filesusr.com/ugd/9e4921_4d67b41b8b5d4888ac665bef7965e6a8.pdf?index=true
    • https://ce099f17-eb12-430b-a452-8d789b3ee5a8.filesusr.com/ugd/aef5b7_f0e30d0d98a24bb3939e48d78d49db9f.pdf?index=true
    • http://lokikigufam.epizy.com/lasugidulokapaw.pdf
    • http://kejajifuwud.rf.gd/86404476858.pdf
    • https://5fb42ee6-a9be-400a-98f2-f9d4b9f720c8.filesusr.com/ugd/1813b3_bf280cdd6be1481b89aafee7430bd3fa.pdf?index=true
    • http://jolijugidepim.rf.gd/dexumitibuvumop.pdf
    • http://rorewoj.rf.gd/98234640002.pdf
    • http://gigapexolazet.rf.gd/srimad_bhagavad_gita_telugu.pdf
    • https://cdfb6f36-dde2-4af5-b3b7-55ff39976061.filesusr.com/ugd/c6ac46_452296bab12c42848faa586ffd611b27.pdf?index=true
    • https://65f7c47b-6fa2-4aed-9649-637438a88329.filesusr.com/ugd/8fb471_10b7ae58be884b51ad285a15b75e7e2a.pdf?index=true
    • https://a50dbba5-e4fd-40cc-afa9-a45495a5accf.filesusr.com/ugd/7f929b_e08a182bc0b04670b021810eb10891cd.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f24f.bin
b4379778d81a066251c8528d436af2965859a088d12a6b7a9a43c6ffa4e2ae7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF24F 5652 bytes
font_01_sfnt_off0001056f.bin
5796d780aea56f95d33454816ae015eaf0f88eb665598483fef03d2373bee84d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1056F 10808 bytes

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