Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfc3833c480f89e2…

MALICIOUS

PDF

76.0 KB Created: 2021-02-15 23:00:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: da996039b00487ee42f7b61919f05754 SHA-1: d7920e13ad13de35df7303f59f97c18278c7ed2a SHA-256: bfc3833c480f89e2f6870439ebeba13b353d40c6da36088cef0da9c1c17db8de
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to lead users to compromised or malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://maypoin.ru/123?utm_term=jumperoo+baby+development PDF link annotation
    • http://podarokinsta365.site/92888446243sr78j.pdfIn PDF document text
    • https://nunipotewisi.weebly.com/uploads/1/3/4/8/134892443/8210931.pdfIn PDF document text
    • http://pek-24.cc/modeling_of_hybrid_renewable_energy_systemsfegwx.pdfIn PDF document text
    • https://mimoleratamofip.weebly.com/uploads/1/3/4/5/134500060/c2137fde4170.pdfIn PDF document text
    • http://blu-ital.space/giwanisimewofavyy3gd.pdfIn PDF document text
    • http://fastpysystem.online/1-100_chart_printableu4etl.pdfIn PDF document text
    • https://nafogoke.weebly.com/uploads/1/3/4/7/134776139/pukitisaviwu.pdfIn PDF document text
    • http://cg-designer.xyz/beckett_baseball_march_2020uw5xd.pdfIn PDF document text
    • http://ludshop.xyz/creative_writing_prompts_worksheets3qdm8.pdfIn PDF document text
    • https://cdn.sqhk.co/tosobulig/Tij2L6X/kupefadopujovu.pdfIn PDF document text
    • https://cdn.sqhk.co/tuledapozato/ggdjeX3/rugiwusegomiraziton.pdfIn PDF document text
    • https://cdn.sqhk.co/fefamuve/jcggha9/free_tv_streaming_app_for_android_box.pdfIn PDF document text
    • https://towuzisutodugo.weebly.com/uploads/1/3/0/9/130969847/4541984.pdfIn PDF document text
    • https://bajarewejewud.weebly.com/uploads/1/3/4/6/134673735/da79f26d89e50.pdfIn PDF document text
    • http://ulekschool.online/802150543630s4yv.pdfIn PDF document text
    • https://degiviwab.weebly.com/uploads/1/3/2/6/132680905/zazuropekavi.pdfIn PDF document text
    • https://fapopadiwa.weebly.com/uploads/1/3/1/4/131438416/zakujidukawamu_zotaz.pdfIn PDF document text
    • http://sreview.online/sample_detailed_lesson_plan_in_englishnszdf.pdfIn PDF document text
    • https://xagapetudiza.weebly.com/uploads/1/3/4/6/134686513/kizuposusokawafir.pdfIn PDF document text
    • http://lg-copyrightforms.com/nifosarakiwikowitixixo041dl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ecea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEA 5216 bytes
SHA-256: 4761042011c2c767447e65acf75f4fd822a0945da57ac027a0625b84ed3f005a
font_01_sfnt_off0000fe96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE96 10712 bytes
SHA-256: 3029a76f2cc9269283ace8ef0fcb568e21e0e6f3a4665c4e1a08778904f6dc08

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