Malicious PDF — malware analysis report

Static analysis result for SHA-256 5df95c86e24a5386…

MALICIOUS

PDF

79.3 KB Created: 2021-03-03 18:05:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 672602acb6c5d4873f8f89558d2543bf SHA-1: 4f5ea19feae5c85825e64a5db29651385809b1bd SHA-256: 5df95c86e24a5386af34b0c684e2654bf9119ce69b475792ea2e2e454dae7560
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, identified as a PDF link farm, with many pointing to potentially malicious redirectors. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs suggest a phishing or SEO manipulation scheme, likely intended to lead users to malicious sites.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=cuanto+es+30+gramos+de+aceite+en+mililitros In PDF document text
    • https://fagisidide.weebly.com/uploads/1/3/2/6/132682833/fdd8a5236.pdfIn PDF document text
    • https://cdn.sqhk.co/xusarukave/J2phbFF/download_aplikasi_gun_shot_fire_war_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/xoresarib/ojdiheh/94255379467.pdfIn PDF document text
    • https://pixizibonemitu.weebly.com/uploads/1/3/1/3/131382366/pedorikujirosirut.pdfIn PDF document text
    • https://cdn.sqhk.co/buwuvibija/hib5ggY/power_warriors_apk_mod.pdfIn PDF document text
    • https://xilemizafijoso.weebly.com/uploads/1/3/4/4/134483217/geritiwi.pdfIn PDF document text
    • https://cdn.sqhk.co/pesuxitum/KgjggOa/rainbow_snake_game.pdfIn PDF document text
    • https://bizotimugir.weebly.com/uploads/1/3/1/1/131164076/7863064.pdfIn PDF document text
    • https://rojukekodeb.weebly.com/uploads/1/3/4/6/134682316/towabigefova.pdfIn PDF document text
    • https://cdn.sqhk.co/posaleren/jmjdigP/zijipunow.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/kiwopusafize/chemical_engineering_tracking_sheet_wpi.pdfIn PDF document text
    • https://s3.amazonaws.com/zodererezuzuxi/vazuxulapiz.pdfIn PDF document text
    • https://s3.amazonaws.com/bokelur/double_bed_sheets_set.pdfIn PDF document text
    • https://s3.amazonaws.com/gumegulaxi/62551565198.pdfIn PDF document text
    • https://s3.amazonaws.com/vexosafugunu/how_to_change_ink_on_hp_8600.pdfIn PDF document text
    • https://s3.amazonaws.com/rumezo/7011558609.pdfIn PDF document text
    • http://rewuwuja.onlinewebshop.net/what_is_a_clinical_pharmacologist.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E1 5468 bytes
SHA-256: 0c374e80a3c96e532b694be66083aa74ea92fe2fa078a6c181c2bb59df96498b
font_01_sfnt_off0000fa5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5D 11500 bytes
SHA-256: 010799171bb3e2921b621997b06a97210c8d2adfc683d88afb234a2b75579d30
font_02_sfnt_off00011fe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE0 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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