Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d22e9e051d6d9ef…

MALICIOUS

PDF

81.0 KB Created: 2021-05-25 07:40:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 385c4da00163bc14e1ecc2d09175f7b6 SHA-1: e9a9334f1131f9ee60327c5baf09c52814005695 SHA-256: 7d22e9e051d6d9ef808b73206707e0b015872e861991ce262b5258e9188e0e95
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 other PDFs, suggesting a link farm or SEO manipulation tactic. One of the primary external links, https://jacksth.ru/strik?utm_term=appleton+farms+ham+cook+time, appears to be a malicious domain. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a phishing or trojan payload. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://jacksth.ru/strik?utm_term=appleton+farms+ham+cook+time PDF link annotation
    • https://feroraja.weebly.com/uploads/1/3/0/9/130969346/tugiviwasumugonop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470841/normal_6013eec0e4a69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412570/normal_6018b82e200f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413109/normal_60462e498696a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466379/normal_5fdc22e28c2bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479902/normal_5fe901e9c2a54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420600/normal_5fd9d34aafacb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415526/normal_601b608828e62.pdfIn PDF document text
    • https://dulebepil.weebly.com/uploads/1/3/3/9/133999512/nodekilox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454054/normal_601de2410235b.pdfIn PDF document text
    • https://jazorematigim.weebly.com/uploads/1/3/4/8/134862517/7608559.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/14c3361a-57dc-40c0-bf90-2fd335b0adba/jesomuxedepobuxuri.pdfIn PDF document text
    • https://s3.amazonaws.com/tigovatolis/zamesezuruva.pdfIn PDF document text
    • https://s3.amazonaws.com/rebomedug/rrb_bangalore_exam_hall_ticket.pdfIn PDF document text
    • https://s3.amazonaws.com/gumagabu/liregavato.pdfIn PDF document text
    • https://s3.amazonaws.com/tarizirefevifab/android_calendar_icon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d641597e-cd77-4302-a1e3-519f243bb669/81171911137.pdfIn PDF document text
    • https://s3.amazonaws.com/xulepiwa/vumulutadowivapuku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/402cbad6-4149-4b85-abf3-ea6c364f3a7a/timex_expedition_chronograph_battery.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64b3b45a-52f8-4a76-9553-a9c8bf1b723f/56930451611.pdfIn PDF document text
    • https://s3.amazonaws.com/nafamaragisek/aida64_extreme_full_version.pdfIn PDF document text
    • https://s3.amazonaws.com/purixifusipelid/reading_programs_for_struggling_readers_in_high_school.pdfIn PDF document text
    • https://s3.amazonaws.com/zafijukopa/12554270990.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_off0000fb93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB93 5308 bytes
SHA-256: 82c816b442d61f038c6cf34947c93b423d0e7f0a6a89510e26d9bd4c44caa0c0
font_01_sfnt_off00010d77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D77 11928 bytes
SHA-256: cf10eb65d962de6fefde4d00ebe04eda9fa5c94b19bd1cb0dc165a5c918d10a2

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