Malicious PDF — malware analysis report

Static analysis result for SHA-256 f55b6f998a00f458…

MALICIOUS

PDF

80.6 KB Created: 2021-05-21 07:43:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4c2514d6b7022b40b13bd1b4a6deaac0 SHA-1: 6aa321f699e7382452ed59bc86888159ec13f36e SHA-256: f55b6f998a00f458f65b0aa5918adb1f586dde228db2c77fec47d6c430855628
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It contains a large number of external links, many pointing to PDF files, suggesting a link farm or SEO manipulation tactic. One of the primary external URLs is https://xezojetit.ru/strik, which is likely the malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xezojetit.ru/strik?utm_term=how+can+i+learn+korean+for+free
    • https://static.s123-cdn-static.com/uploads/4427780/normal_5feb3358d2357.pdf
    • https://cdn-cms.f-static.net/uploads/4462736/normal_6060926ee17a2.pdf
    • https://gubilipolijig.weebly.com/uploads/1/3/4/7/134707964/niwibawinebujidezo.pdf
    • https://zakupiza.weebly.com/uploads/1/3/5/9/135960967/7346196.pdf
    • https://pafegesufo.weebly.com/uploads/1/3/4/7/134719460/2b8449eafe605e.pdf
    • https://rigoxetevub.weebly.com/uploads/1/3/4/0/134017132/sebotonikodesogafa.pdf
    • https://cdn-cms.f-static.net/uploads/4370284/normal_60443dc4c3915.pdf
    • https://jitebogegamoma.weebly.com/uploads/1/3/4/7/134761197/9172858.pdf
    • https://rugepokowefi.weebly.com/uploads/1/3/5/2/135294276/lurufofade.pdf
    • https://zogeliwev.weebly.com/uploads/1/3/4/3/134353139/4056706.pdf
    • https://rudiwiguxovo.weebly.com/uploads/1/3/5/3/135317070/zupijix-jebifizizu-vaxedi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zagapaxa/91962571941.pdf
    • https://s3.amazonaws.com/vuraradaso/android_create_view_programmatically_attributeset.pdf
    • https://s3.amazonaws.com/wazagidonux/28202954376.pdf
    • https://uploads.strikinglycdn.com/files/4cf5b450-aa6d-462a-9d7c-f25a5dd95606/bopumo.pdf
    • https://uploads.strikinglycdn.com/files/107ff681-7e69-4bff-9feb-c232f2337e74/starbucks_barista_user_manual.pdf
    • https://s3.amazonaws.com/posaxugidut/jedivuseza.pdf
    • https://uploads.strikinglycdn.com/files/02a58419-86af-4490-aa0f-e205d6f2659e/36594432231.pdf
    • https://s3.amazonaws.com/jolituzoji/catholic_deliverance_prayers.pdf
    • https://uploads.strikinglycdn.com/files/744a3fb6-4d54-461a-822a-8ef1711cf510/tilijunudunomunobuwor.pdf
    • https://s3.amazonaws.com/rafiralexezol/mammoth_mountain_weather_report.pdf
    • https://s3.amazonaws.com/rokuwapesu/41402472234.pdf
    • https://uploads.strikinglycdn.com/files/80908f8e-67a0-40b2-90a1-ca1e436eff53/kukegej.pdf
    • https://s3.amazonaws.com/fofeguj/tesulerud.pdf
    • https://s3.amazonaws.com/bivanud/street_fighter_apk_free_for_android.pdf
    • https://s3.amazonaws.com/donukadizolin/vujukenunivelifibiza.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_off0000fd89.bin
9ba1e4f91ddb7df484fa45b389b5f82e837355efd49c2e39d88ca11ad4a594a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD89 4812 bytes
font_01_sfnt_off00010e09.bin
e5a3f9a219222f4069e821b658b74559b1142702340cf5ce0fa8215472521724		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E09 11544 bytes

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