Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcdb7e374c293f4c…

MALICIOUS

PDF

77.4 KB Created: 2021-03-29 18:11:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 283bbb39f07a14f83fc827a5a5c62ad5 SHA-1: 886075389eb3e6157138a423d8df8a26cf1ee1c9 SHA-256: fcdb7e374c293f4c8981f4cb9a1d060765ba897bf83fae383cac2a518c082b84
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting a phishing or malware distribution campaign. The presence of external URIs and the overall structure strongly suggest the document is designed to redirect users to potentially harmful 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://golowaki.ru/strik?utm_term=how+to+make+gif+on+photoshop+from+video PDF link annotation
    • https://cdn.sqhk.co/pumevigatare/AifahfK/50547701045.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365642/normal_5ff0f64a96652.pdfIn PDF document text
    • https://lefaxujil.weebly.com/uploads/1/3/0/7/130739779/f2d57c32a2e90c7.pdfIn PDF document text
    • https://cdn.sqhk.co/penuvipaw/igIJ1gc/miviwezojelovikesuxesomu.pdfIn PDF document text
    • https://cdn.sqhk.co/sagitusat/dHjfift/garibaldi_provincial_park_trail_report.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500669/normal_604d112aa552c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377717/normal_5fe39e320e636.pdfIn PDF document text
    • http://help-mediasupport.com/multiplying_fractions_with_area_model_worksheet1zle2.pdfIn PDF document text
    • http://changely.club/klipsch_promedia_2.1_bluetooth_review2nv08.pdfIn PDF document text
    • https://juzoliposiwe.weebly.com/uploads/1/3/4/3/134322138/wosutanavidikamok.pdfIn PDF document text
    • http://zijiwox.iblogger.org/carbohydrates_food_chemistry.pdfIn PDF document text
    • http://fsbsiod.com/xujeluramumosiz4ph88.pdfIn PDF document text
    • http://reabook.online/intermec_pm4i_driver_windows_7rqnbk.pdfIn PDF document text
    • https://cdn.sqhk.co/jujifefa/SGWKghf/moribafawazowitozereso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391305/normal_5fd5f484517e6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dimakadube.epizy.com/86796594463.pdfIn PDF document text
    • http://memekafese.rf.gd/51465718283.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2da79f1-d9d0-4089-bc6d-fc65459264ae/70266871215.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/731d76c6-4986-45fe-8874-717a2c153274/xizesexefawof.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_off0000efd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD8 5600 bytes
SHA-256: 7fea243d76552d617690da6a17874a94c369b5a822a14e1479d33005b035d36e
font_01_sfnt_off000102d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D4 10932 bytes
SHA-256: 39ac6a43acf7a0c8f6cb9179ab7173a321690ae27cb1ddce3819c76ffe215162

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