Malicious PDF — malware analysis report

Static analysis result for SHA-256 b545aefaec9659cc…

MALICIOUS

PDF

78.8 KB Created: 2021-03-28 13:30:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc1d818066436f6be05a62beebb66484 SHA-1: 51ba92d5f8f80a979107e3eb723f191d60d6051e SHA-256: b545aefaec9659cc79b3c53753598397e4683e1f06cf33ee11905ade176cda66
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a 'link farm on disposable hosting'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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 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://golowaki.ru/strik?utm_term=renova+zero+pod+melbourne
    • https://cdn-cms.f-static.net/uploads/4366007/normal_6026366db17e0.pdf
    • https://static.s123-cdn-static.com/uploads/4421940/normal_60072ed7d03ad.pdf
    • https://cdn-cms.f-static.net/uploads/4490724/normal_6038d6d8a8e34.pdf
    • https://cdn.sqhk.co/soxobiwefili/H04Swgj/46791784311.pdf
    • https://cdn.sqhk.co/tumosirewuw/ciihaij/gexoputajafudekijarobim.pdf
    • http://lifizix.22web.org/samsung_refrigerator_washing_machine_repair_service_center_in_tughlakabad_new_delhi_delhi.pdf
    • http://bezigex.iblogger.org/93959634349.pdf
    • http://tarosuzaloku.22web.org/cdl_practice_test_ohio.pdf
    • https://cdn-cms.f-static.net/uploads/4484358/normal_605c503e5977a.pdf
    • https://sodamosubiduv.weebly.com/uploads/1/3/4/0/134012739/jodinejov-vupil.pdf
    • https://cdn.sqhk.co/sevafeluba/CgchjS3/prepper_survival_guide_magazine.pdf
    • https://cdn.sqhk.co/ximirujusuxo/ggic4ib/learning_android_development_in_2020.pdf
    • https://cdn.sqhk.co/wuzexesetaba/ihcpji3/21047000750.pdf
    • https://static.s123-cdn-static.com/uploads/4476007/normal_5ffdd0bae4602.pdf
    • https://tiwokixaxuvap.weebly.com/uploads/1/3/4/2/134235176/gusani-jiwalijo.pdf
    • https://zipazoraxegav.weebly.com/uploads/1/3/4/3/134325660/ziluliw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://gagafexekoxoseb.epizy.com/15481088295.pdf
    • http://zelobiliteriwe.rf.gd/jawbone_up2_guide.pdf
    • https://uploads.strikinglycdn.com/files/946e99f4-6dcf-4164-8a54-a11dbbd906f0/a_lesson_before_dying_chapter_5_and_6_summary.pdf
    • https://uploads.strikinglycdn.com/files/be0f9d29-57a5-442f-b499-969e5e10451a/how_to_calculate_heat_energy_change_chemistry.pdf
    • https://uploads.strikinglycdn.com/files/1e39290d-26d6-4c89-bd25-76bc517697fe/jiduxaxifurisasit.pdf
    • http://faxejufoli.epizy.com/94091032617.pdf
    • https://uploads.strikinglycdn.com/files/093e8177-a631-4698-9034-7ea46e873f14/6908550258.pdf
    • http://xonesopidazuju.epizy.com/37706698569.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea32.bin
a84d008efc9831d38670c0e1d365d63cfa0cf13beb441a020299e9bc066cec7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA32 4940 bytes
font_01_sfnt_off0000fadf.bin
41052a8f9b5723c6797f2ec49bbf22310367db75fe93677a86c5aee2eb0e0c53		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFADF 10840 bytes
font_02_sfnt_off00011fe1.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE1 4324 bytes

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