Malicious PDF — malware analysis report

Static analysis result for SHA-256 d09375dfde9b7df2…

MALICIOUS

PDF

79.5 KB Created: 2021-04-12 01:54:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 1367ab5ef476f5fc2a017abe862b4616 SHA-1: ed84340b777d9597956bc6dc39ab955f01ce3d76 SHA-256: d09375dfde9b7df207b372bb9726c483a88d0b4103a1890cd004201607ba410b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files, suggesting a link farm or redirection mechanism. The primary URL, https://druttle.ru/strik?utm_term=when+you+share+someone%2527s+post+on+facebook+do+they+know, is suspicious and likely leads to a phishing or malware distribution site. The ML classifier and ClamAV detection strongly indicate malicious intent.

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 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.
  • 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://druttle.ru/strik?utm_term=when+you+share+someone%2527s+post+on+facebook+do+they+know PDF link annotation
    • https://gavofazipog.weebly.com/uploads/1/3/3/9/133999173/3464715.pdfIn PDF document text
    • https://daxuvinu.weebly.com/uploads/1/3/2/6/132695190/zunibap-gigul-mopedewabig-zevabewibik.pdfIn PDF document text
    • https://cdn.sqhk.co/bubesuzax/hhdgidq/dezilom.pdfIn PDF document text
    • https://cdn.sqhk.co/murafabu/TDjdijb/xemerogobasiluzejiw.pdfIn PDF document text
    • https://wadamosemexijep.weebly.com/uploads/1/3/4/4/134434227/5e16ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476002/normal_6042f04515be7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385863/normal_5fd831155a0be.pdfIn PDF document text
    • https://welavomuwaj.weebly.com/uploads/1/3/4/6/134633166/99d30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463300/normal_6026159bcb492.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvakumo/hhefhbs/iphone_weather_app_not_showing_air_quality.pdfIn PDF document text
    • https://zojovotonoturur.weebly.com/uploads/1/3/5/3/135348007/6843bdf5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://37e79482-e567-4eff-b449-6ea9b90d4679.filesusr.com/ugd/cff0cd_563094b045454f15b74863b4a40659e2.pdf?index=trueIn PDF document text
    • https://5fb42ee6-a9be-400a-98f2-f9d4b9f720c8.filesusr.com/ugd/1813b3_c8ac75331ccc42e6a34fee621a2f9c28.pdf?index=trueIn PDF document text
    • https://ca30e0e0-ecf2-44ab-b6a2-fe26291458be.filesusr.com/ugd/34e21e_654877ef04d841ba80431d75a7f8860c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vuzotisenixava/cobra_29_ltd_classic_channel_mods.pdfIn PDF document text
    • https://s3.amazonaws.com/vovuzize/5980910829.pdfIn PDF document text
    • https://s3.amazonaws.com/minabiwa/ratisowukewitosataxezi.pdfIn PDF document text
    • https://de2a8dfc-dc8d-4d62-be3b-f97abdd17bf6.filesusr.com/ugd/c722c2_e60374735ca54a1ab3dad2e16d83e276.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tidigudetefumof/fekisorudezupisisol.pdfIn PDF document text
    • https://a867a740-3546-49c9-bb92-c76f735cad7e.filesusr.com/ugd/c312ff_35bb52bf2d7c4a0e9d6f91422b3de08c.pdf?index=trueIn 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_off0000f712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF712 5808 bytes
SHA-256: 0968df59f7435b6feaa2c0afb6196d7ee961dc2318e960cf465d6e61d8697f80
font_01_sfnt_off00010ad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD1 11160 bytes
SHA-256: 35663b69533a9e3981d811584e932d104453ce4e581eda500260ae9413f85ac2

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