Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1130fb44165fee4…

MALICIOUS

PDF

71.3 KB Created: 2021-03-02 01:38:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 213a296d3b466abd3832bc3c775c64fa SHA-1: 45d97335f88bebb133838015bba91240e424cdbd SHA-256: d1130fb44165fee420a7fb5ca827eae500a0e76992fbe4bcd7428989508cf982
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains and link farms, suggesting a phishing or SEO spam campaign. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a keyword search term, further supporting the lure-based attack pattern.

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=algebra+1+flipped+classroom PDF link annotation
    • https://cdn.sqhk.co/sowumavag/ie4ifig/63947154137.pdfIn PDF document text
    • https://lixubirenolona.weebly.com/uploads/1/3/4/6/134669397/fuwoditonabijow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375073/normal_6037944d45b3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374211/normal_5fe8cc5d57b72.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426686/normal_5fda7ee698f82.pdfIn PDF document text
    • http://gepokupaburorew.mywebcommunity.org/210693119.pdfIn PDF document text
    • https://cdn.sqhk.co/fulaxanew/ihg0ibX/tusoson.pdfIn PDF document text
    • http://lagulesuko.medianewsonline.com/windows_10_turn_off_screen_hotkey.pdfIn PDF document text
    • https://losiweso.weebly.com/uploads/1/3/1/3/131380476/radefosuwudinazaror.pdfIn PDF document text
    • https://jiwepeduvebata.weebly.com/uploads/1/3/1/4/131456267/eec46.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gosaduzunake.myartsonline.com/how_to_find_the_fgx.pdfIn PDF document text
    • https://s3.amazonaws.com/ravuxudibure/the_princess_bride_game_free.pdfIn PDF document text
    • http://wejufutaz.onlinewebshop.net/newaruva.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxalowafokuvo/15_chemical_kinetics_rate_laws_worksheet_answers.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_off0000d923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD923 5656 bytes
SHA-256: 282cc9b4c4196465df27218f59f4159d890902583dbaf2d40a96814a917de0f7
font_01_sfnt_off0000ec55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC55 10580 bytes
SHA-256: 205b9a5ad7440de7a76d0ee0914ad0cccd2274d92354096217381b426a06e738

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