Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce4ad13d3cb18f73…

MALICIOUS

PDF

76.8 KB Created: 2021-03-15 11:17:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f180873166389898ad0a9f4adc2b8645 SHA-1: 757d8ea2a28b737481ea1a3f2ea4cb997e361b14 SHA-256: ce4ad13d3cb18f733e939f38bc1f20900a554453efb4ba908261005d1a9fd802
214 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, specifically flagged for containing a malicious redirector link and a large number of external PDF links. The embedded links, such as 'https://yafferge.ru/wix?keyword=words+for+rude', are likely intended to lead users to phishing sites or download further malicious content. The presence of numerous links suggests a broad attempt to compromise users through various lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/wix?keyword=words+for+rude
    • https://fipoxojumudex.weebly.com/uploads/1/3/4/6/134649093/e0843a.pdf
    • http://ig-about.net/tinder_gold_free_trial12n00.pdf
    • https://ruwatija.weebly.com/uploads/1/3/4/8/134846771/kibime.pdf
    • http://50offit.pro/780302678074mqfi.pdf
    • https://raxeruzuk.weebly.com/uploads/1/3/4/7/134743740/mazosoxezuliwidat.pdf
    • https://werumitepoli.weebly.com/uploads/1/3/0/7/130739038/bb99e38.pdf
    • http://lalabomujulimof.mywebcommunity.org/libros_gratis_de_ren_gunon.pdf
    • https://widonudafedezu.weebly.com/uploads/1/3/0/7/130776490/6975310.pdf
    • https://rotarivinevi.weebly.com/uploads/1/3/4/5/134599250/dd3719c07.pdf
    • https://cdn-cms.f-static.net/uploads/4410414/normal_60313d276e30b.pdf
    • https://rojanudase.weebly.com/uploads/1/3/0/9/130969060/a2afba59b0395.pdf
    • https://cdn-cms.f-static.net/uploads/4501659/normal_6011e2986abfa.pdf
    • https://fenizivafuno.weebly.com/uploads/1/3/1/3/131380836/24eff009df.pdf
    • https://static.s123-cdn-static.com/uploads/4366014/normal_5febda746ea14.pdf
    • https://sokepubin.weebly.com/uploads/1/3/5/3/135391759/5621046.pdf
    • https://static.s123-cdn-static.com/uploads/4473445/normal_5fcd3ba8bf178.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fotepopunaj/best_dragon_ball_games_for_android_2018.pdf
    • https://s3.amazonaws.com/nawosineromigi/34550607593.pdf
    • http://dasobiviwadodaj.atwebpages.com/what_after_gm_diet_plan.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3a6.bin
58ab8f603622f1fe30c8305fa94d366df80a8bdeea24c52615de121e97f8f54a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A6 4672 bytes
font_01_sfnt_off000103a7.bin
824790b26bb2f5f237d2c5e39c4787ae08c497ad63d64603ff374f573f93feb6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103A7 10140 bytes

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