Malicious PDF — malware analysis report

Static analysis result for SHA-256 15831b25ce21d2d9…

MALICIOUS

PDF

68.5 KB Created: 2021-03-23 06:55:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 00bc7bccc93216776a15c198b45a910c SHA-1: 3b6138520a41261b620ac180f84d256466960f07 SHA-256: 15831b25ce21d2d9e5ffbee9c5d80dd3baa952e1125c633cfa8ca2130bda1753
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external URIs, including one pointing to 'fokemale.ru', suggests the document is part of a link farm designed to redirect users to potentially harmful content. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf', suggesting it may have been generated programmatically to obscure its malicious nature. The primary attack pattern involves luring users to external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://fokemale.ru/wix?keyword=opsec+planning+should+focus+on+quizlet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4378153/normal_6038e6861e029.pdfIn PDF document text
    • http://kedepoba.sportsontheweb.net/75442823549.pdfIn PDF document text
    • https://xevujudibibabus.weebly.com/uploads/1/3/4/5/134599482/9035365.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372702/normal_5ffb3bd2169fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406202/normal_6017bc78877e5.pdfIn PDF document text
    • https://kezofufilulo.weebly.com/uploads/1/3/4/4/134488682/vatutasibenegu.pdfIn PDF document text
    • http://makelemeg.mygamesonline.org/47403182966.pdfIn PDF document text
    • https://rixuxakixolewe.weebly.com/uploads/1/3/1/3/131380342/7a5a05871bf47.pdfIn PDF document text
    • https://rujupiben.weebly.com/uploads/1/3/4/8/134852491/wumudebabotiniteri.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388160/normal_60478152ae2c0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419412/normal_5fce2a176a231.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/e08febad-a8ab-45cb-bdcb-eec15bdc25b3/84268591851.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e3a8f2f-3579-4d59-9520-b09f6677064d/dirt_devil_power_express_lite_stick_vacuum_red.pdfIn PDF document text
    • http://vatonafikokex.atwebpages.com/heat_treatment_of_austenitic_stainless_steel.pdfIn PDF document text
    • http://pidusagi.atwebpages.com/clinical_anatomy_of_the_spine_spinal_cord_and_ans.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7adbe359-ef8f-48c8-a21c-1ae39dd9ebfa/71198341777.pdfIn PDF document text
    • http://xabudavadeguvo.myartsonline.com/xetavokubokebezubesa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0325f1cb-04d9-4aac-b295-ba37e9579bcd/how_to_lose_weight_quick_diet_plan.pdfIn PDF document text
    • http://vamavaremimot.atwebpages.com/insert_blank_page_in_acrobat_8.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_off0000cfe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE6 5524 bytes
SHA-256: 6dc3a0557bc7318d88af65a8e362fa5792ae55d58a813e9f9d42bc765c731b4f
font_01_sfnt_off0000e2ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AC 9876 bytes
SHA-256: cb33d4e865e37ce2d0599077259c8a48ba22da2b4f6b5fb3807edab723f4d67a

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