Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3b1dcb54008e87f…

MALICIOUS

PDF

78.6 KB Created: 2021-03-18 10:13:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 8ad0c0e586f267f1a59c6f06b7809f08 SHA-1: de93c8d158ef9c4b66caa8c17930f95155d5de4b SHA-256: f3b1dcb54008e87f0d72afb7881994f90fe40934a83fbcb554e8bcdafe1bb5f6
126 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous external URIs, with several pointing to disposable domains and link farms, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the PDF's structure strongly suggest it is used as a lure to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/award?keyword=complex+numbers+solved+examples+pdf PDF link annotation
    • http://dfahsdfgjsfg.online/do_you_wear_scrubs_in_dental_schoolpf664.pdfIn PDF document text
    • https://cdn.sqhk.co/wanuvudeb/2jbjd1h/gynaecology_history_template.pdfIn PDF document text
    • http://alcozerox.com/161081997583gosf.pdfIn PDF document text
    • http://contarinihome.com/pagetovutusira72mc1.pdfIn PDF document text
    • https://nagipunewemog.weebly.com/uploads/1/3/5/3/135315215/7f8c9cfeb9a.pdfIn PDF document text
    • http://spindlndou.space/poweramp_full_cracked_mod_apkgx11y.pdfIn PDF document text
    • http://55571.ru/how_to_make_freckles_go_away_with_lemon_juicentr3b.pdfIn PDF document text
    • https://cdn.sqhk.co/wutalididow/ejcjiCl/34744402772.pdfIn PDF document text
    • http://lnstagramcopyrightcenter.com/mojutowejumixaralsghg.pdfIn PDF document text
    • http://biomanua.website/vusiweniseluferu37rw2.pdfIn PDF document text
    • https://cdn.sqhk.co/kekotenonaxu/5icgcXC/59717195825.pdfIn PDF document text
    • http://tricitysikhs.com/how_to_thaw_frozen_juice_concentratekdtwg.pdfIn PDF document text
    • https://senidexug.weebly.com/uploads/1/3/0/7/130775540/2559002.pdfIn PDF document text
    • https://sitapiwagese.weebly.com/uploads/1/3/0/8/130814355/wewixirolesod-gejoto.pdfIn PDF document text
    • https://gasaromub.weebly.com/uploads/1/3/0/7/130776100/568c75975be.pdfIn PDF document text
    • https://dubitofux.weebly.com/uploads/1/3/4/4/134458445/3188349.pdfIn PDF document text
    • http://netewe9.xyz/zikumesetefekoli37mxv.pdfIn PDF document text
    • https://cdn.sqhk.co/tebefaravuz/euu2jiV/world_war_2_mod_minecraft_1._7._10.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wiwamoxamo/almohadones_infantiles_con_formas.pdfIn PDF document text
    • https://s3.amazonaws.com/zafibimutadoti/cabinet_maker_software_free.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_off0000f40f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40F 5360 bytes
SHA-256: 62a74d5cc7a1fc98d7f1acb3d4f71fd5c7d798709f8fca50fa05b2b57ecf73fd
font_01_sfnt_off0001062c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062C 11384 bytes
SHA-256: 231e8cd35750e7beaa1bf8ea1a448821a053c0c9356a00b9678e26eb041393b9

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