Malicious PDF — malware analysis report

Static analysis result for SHA-256 4910b58d30f4c262…

MALICIOUS

PDF

71.1 KB Created: 2021-02-18 01:54:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: c04030000f1a263ba5079d33ff49d257 SHA-1: 170f99a64ee0046b1dd74dbfc05d900420292eb0 SHA-256: 4910b58d30f4c26296ea0bfad874fff9af20b160d13ccbca2511da664f0e5fd7
184 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical alert for linking to known malicious redirector infrastructure. The document contains a large number of embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the nature of the embedded links and the ML classifier output strongly indicate a malicious intent to redirect users to harmful content.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=iso+ts+16949+certification+handbook In PDF document text
    • https://laxigotugib.weebly.com/uploads/1/3/0/9/130969680/00b39e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371498/normal_5fea3e738d8c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426085/normal_602aceea55d8b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385850/normal_5feef46ca69cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370267/normal_602d957e5acde.pdfIn PDF document text
    • https://cdn.sqhk.co/wadupaxi/fpohdan/the_last_door_1_walkthrough.pdfIn PDF document text
    • https://cdn.sqhk.co/buvaboda/dCSjdha/virus_definition_computer_network.pdfIn PDF document text
    • https://cdn.sqhk.co/dizoketa/jcUdiie/kovigedumolawimixesuleki.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384633/normal_6003278373a24.pdfIn PDF document text
    • https://peramixirado.weebly.com/uploads/1/3/1/6/131637131/vomutotejagagi.pdfIn PDF document text
    • https://digafixi.weebly.com/uploads/1/3/0/7/130776371/nexolaretisutukeli.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415964/normal_5fed5cf348bca.pdfIn PDF document text
    • https://lukazerud.weebly.com/uploads/1/3/4/3/134343231/916e5b12697.pdfIn PDF document text
    • https://sutukedepebovi.weebly.com/uploads/1/3/4/7/134753024/kunaverevo.pdfIn PDF document text
    • https://riviruzo.weebly.com/uploads/1/3/0/7/130739493/jipifoxivipopot_pelixobo_wisovurizegokub_powopono.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421641/normal_5fcc9eef2beb9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fizuxobitunoge.epizy.com/wamemopiwovositunip.pdfIn PDF document text
    • http://gunubepixel.epizy.com/shankara_song_mr_jatt.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_off0000d5e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E4 5668 bytes
SHA-256: 5412fd04cc8f572e7103d0cbffae3ce9f8133d277c5265bf26f19b6a165bfe72
font_01_sfnt_off0000e91f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91F 10724 bytes
SHA-256: 2ec4fa6fe3d1f9dc5127e68bb96b487da2b9397c9f7fff96da08f1292b8dc57b

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