Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd9e0a521352b89c…

MALICIOUS

PDF

78.0 KB Created: 2021-03-19 18:50:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e5b7144f1eac6d2c70cb73458241210 SHA-1: 71b92be7fc1e799673a25f8a6826b25fdd2623ca SHA-256: fd9e0a521352b89c87b7011400f15b3fbe3d0c8b51e6d8674229b4a58ab21eac
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are embedded within what appears to be a link farm designed to mimic search results. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and extensive external linking suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://kuzutuzo.ru/wix?keyword=night+of+the+twisters+packet+answers
    • https://cdn-cms.f-static.net/uploads/4488329/normal_6018d8c2896d3.pdf
    • https://cdn-cms.f-static.net/uploads/4407100/normal_6023d59d3fde5.pdf
    • https://cdn-cms.f-static.net/uploads/4470027/normal_5fd672437e4f4.pdf
    • http://rubisteq.online/how_to_setup_cisco_dpc3825jwcci.pdf
    • https://cdn-cms.f-static.net/uploads/4482872/normal_6053c90b1a36d.pdf
    • http://yarrebitteh.online/sentry_safe_battery_replacementanlmj.pdf
    • http://e-devletturkiyeaidatsistemimgovtr.com/new_york_city_tourist_attraction_crossword_clue694or.pdf
    • https://static.s123-cdn-static.com/uploads/4474231/normal_5fcb2d0026ea4.pdf
    • http://life-news.tech/83408124066cu3n3.pdf
    • https://static.s123-cdn-static.com/uploads/4380214/normal_5fefe69fe16e6.pdf
    • https://muzekulukusutaw.weebly.com/uploads/1/3/5/2/135296419/b967adc5.pdf
    • https://cdn-cms.f-static.net/uploads/4369304/normal_6020d92726c42.pdf
    • https://cdn-cms.f-static.net/uploads/4385010/normal_603ab3c13d35c.pdf
    • https://dimavuvinidet.weebly.com/uploads/1/3/1/3/131397938/nipilejimemowimil.pdf
    • https://dizilezojo.weebly.com/uploads/1/3/4/2/134234798/38419.pdf
    • https://mitojebani.weebly.com/uploads/1/3/2/7/132711961/86e0bbac15aa5.pdf
    • https://lopatitegadusi.weebly.com/uploads/1/3/5/3/135311006/dumekobef_sotafopadab.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wovedukevikov/66027560178.pdf
    • https://uploads.strikinglycdn.com/files/803ff7d8-eb8f-45be-9364-f48ee0c59153/1995_yamaha_kodiak_400_battery.pdf
    • https://s3.amazonaws.com/fukepez/53612578721.pdf
    • https://s3.amazonaws.com/lusegokaves/peter_thiel_0_to_1.pdf
    • https://uploads.strikinglycdn.com/files/c57e5b7b-b2a5-409d-9a63-29cf4a39edc4/the_study_of_human_geography_section_1.pdf
    • https://uploads.strikinglycdn.com/files/a051729e-54e7-4dcd-8f37-4a7a0dee5642/tabla_periodica_grupos_periodos_y_familias.pdf
    • https://s3.amazonaws.com/mejobu/26146031078.pdf
    • https://uploads.strikinglycdn.com/files/a71ba4a8-34ec-403d-9870-de1fa410ad99/bejomabol.pdf
    • https://uploads.strikinglycdn.com/files/18a100fe-d51e-4eac-a132-a9b1e58b8430/how_to_crack_microsoft_project.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_off0000f179.bin
1205a1721131e6a3893e0c491af028e4957ab112c234b25a2177e98f52ad1e98		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF179 5372 bytes
font_01_sfnt_off000103dd.bin
7f698e4f8613c20a1b2de6ee9b14ab15b5023b8e84e3983990ac80213ad16a00		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103DD 11152 bytes

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