Malicious PDF — malware analysis report

Static analysis result for SHA-256 c13c6feb0945fd34…

MALICIOUS

PDF

76.0 KB Created: 2021-02-20 01:38:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8b53f54ea7ea56bcbcaeee4133283c10 SHA-1: 9de08871f01754e5c6723ffef96d0b3e8e143356 SHA-256: c13c6feb0945fd3471ff5c564f49215125ed011fd3bcb726134f3d26b22eb54b
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing attempt. It contains a large number of external links, including one that impersonates a jury summons, likely to deceive recipients into clicking through to malicious sites. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/wix?keyword=jury+summons+letter
    • https://static.s123-cdn-static.com/uploads/4388165/normal_5feba377a966c.pdf
    • https://static.s123-cdn-static.com/uploads/4425214/normal_5ff64f698dd63.pdf
    • https://cdn-cms.f-static.net/uploads/4406516/normal_601bcf8048d15.pdf
    • https://woziwapimarezex.weebly.com/uploads/1/3/5/4/135400795/garatalifizupikopo.pdf
    • https://static.s123-cdn-static.com/uploads/4419003/normal_5fcff2d98be29.pdf
    • https://xogoluxoso.weebly.com/uploads/1/3/4/4/134444279/reses_jovepaduzipad_xemigawixodik.pdf
    • https://static.s123-cdn-static.com/uploads/4416810/normal_5ff00b5f6cad5.pdf
    • https://cdn.sqhk.co/tibapopedeka/gegefgd/ziderabozane.pdf
    • https://cdn-cms.f-static.net/uploads/4474723/normal_5fda006785396.pdf
    • https://cdn.sqhk.co/potonefamuve/ijIdnge/duwej.pdf
    • https://static.s123-cdn-static.com/uploads/4403422/normal_5fc8fa5d2f5ae.pdf
    • https://cdn.sqhk.co/biwopeka/ctXhf8E/56762813029.pdf
    • https://satewode.weebly.com/uploads/1/3/1/4/131407014/6e3d6d.pdf
    • https://static.s123-cdn-static.com/uploads/4457582/normal_5ffcd2322d309.pdf
    • https://cdn.sqhk.co/mebosuxular/idEhgih/photo_to_video_movie_maker_app_download.pdf
    • https://fudegedetet.weebly.com/uploads/1/3/4/7/134733785/30d29adf9.pdf
    • https://cdn-cms.f-static.net/uploads/4444351/normal_6028401811410.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/wewiro/tobakamubale.pdf
    • https://s3.amazonaws.com/zurovajij/b_extract_form_maharashtra.pdf
    • https://s3.amazonaws.com/faluzotixupi/disney_world_park_hours_nov_2019.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e253.bin
514050e46745eb157679afa4d81baff04d3fb0c6461330f941094e6563102fcb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE253 4544 bytes
font_01_sfnt_off0000f1b6.bin
afe7b63ce6dfe6c8b9fde22842c80110f3da793c3dc273accbf9e867c08f9388		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B6 10336 bytes
font_02_sfnt_off0001151a.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1151A 4324 bytes

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