Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2bff136591413b1…

MALICIOUS

PDF

164.2 KB Created: 2021-01-06 03:42:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 16550be88c6738321b5ce1410256b980 SHA-1: 021a6de4d56830bf455b6d88a465a7e665333a55 SHA-256: b2bff136591413b19fa4d2e21adcb606a264f296731eda449909c81f5b17833d
192 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by a ML classifier and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. It contains numerous embedded URLs, with at least one identified as a malicious redirector (ggtraff.ru). The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs. The presence of a link farm on disposable hosting further supports a malicious intent to direct users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://ggtraff.ru/aws?utm_term=basket+case+tab+pdf In PDF document text
    • https://dajexuxeguse.weebly.com/uploads/1/3/4/8/134859846/zutojidomevet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372737/normal_5f92953cf0eea.pdfIn PDF document text
    • https://nijasofefovo.weebly.com/uploads/1/3/4/7/134719995/2522568.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482424/normal_5ff5130c24fb1.pdfIn PDF document text
    • https://cdn.sqhk.co/wubumeze/GBjb538/kekeruxag.pdfIn PDF document text
    • https://cdn.sqhk.co/wivodojeg/6ahiogc/art_for_kids_hub_folding_surprise.pdfIn PDF document text
    • https://bevikafu.weebly.com/uploads/1/3/4/7/134710030/navomoduwaganu_lexiwagebelim_budigegi_gigakisirul.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/f6ff759f-e65c-4198-bcd7-cdfad2d0086a/zombie_killer_game.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bb35979-669d-4c83-9bf9-0afd6915f536/81651828533.pdfIn PDF document text
    • https://s3.amazonaws.com/polojuliragam/guided_reading_activities_for_year_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39d382c1-71fd-498e-8dd3-f731fb48dbc8/tofikajafunuvovasosa.pdfIn PDF document text
    • https://s3.amazonaws.com/biwubeleba/solicitud_de_amazon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34fd1c4a-f6b1-40a4-93ac-6da98fa4f706/83661589304.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_off00024907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24907 5276 bytes
SHA-256: 22ef81f0d71106f8dc037a0bfe2ddfa86450e46676b3706562aa6d70020ed02f
font_01_sfnt_off00025b0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25B0F 12784 bytes
SHA-256: e090e62a381c7c92cee79741940ba946b81ed24cad8b14b8d95c6aa712513619

Open this report in the interactive analyzer, or submit your own file for analysis.