Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6320179bccf204c…

MALICIOUS

PDF

76.6 KB Created: 2021-02-14 18:37:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: dab2c1261832b2e17da91d96ea5cf890 SHA-1: b58e4d8191f51a7f32f4fa1e0a099b925b2b5463 SHA-256: f6320179bccf204c79466a4ffdd0bcb4094a830c56f1cb0cf21237a012ca7405
146 Risk Score

Malware Insights

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

The sample was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The 'SE_CALLBACK_LURE' heuristic specifically points to a callback phishing or tech-support scam pattern, where the document likely prompts the user to call a phone number. While no scripts were explicitly extracted, the presence of numerous external URLs, many on disposable hosting, suggests a phishing or scam attempt to redirect users to malicious sites. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'Qt', indicating it was likely generated by a tool rather than being a legitimate document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://bologen.ru/wix?keyword=capitulo+7b-1+answers PDF link annotation
    • http://yazansoft.com/7516590789kjvbb.pdfIn PDF document text
    • http://mijuxub.66ghz.com/tafupazuwasavesaxilukij.pdfIn PDF document text
    • http://cocobeautybar.ca/91154462676y41w.pdfIn PDF document text
    • http://alsamcctv.com/tetegijogumefulnr.pdfIn PDF document text
    • http://excellent-spb.ru/balarahhpa.pdfIn PDF document text
    • http://citruss.space/windows_7_ultimate_32_bit_kickass_doqwudj.pdfIn PDF document text
    • https://cdn.sqhk.co/zovaratigu/gcNUFnL/vupawujifopej.pdfIn PDF document text
    • http://agentsecure.space/37477944983a8tdx.pdfIn PDF document text
    • https://foxufaba.weebly.com/uploads/1/3/1/4/131482874/kiveworenamodu_sokired_xafulebenesax_rofabuzupabu.pdfIn PDF document text
    • https://cdn.sqhk.co/gonolesuzam/40xvaHe/7809047873.pdfIn PDF document text
    • https://lumevukivejus.weebly.com/uploads/1/3/0/8/130874583/3478479.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
    • http://vobujilub.epizy.com/sample_service_invoice_template_word.pdfIn PDF document text
    • http://natadomemorad.epizy.com/pudig.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d85c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD85C 5112 bytes
SHA-256: c3991b8025c10e956129c592bb95b812a87c692d3bff5067fe2a0cb8274ab25b
font_01_sfnt_off0000e9e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E5 1852 bytes
SHA-256: 227364d9dba4550c19188fba31a52a63e2f4f414b285d49ae8d9199a01c55a4f
font_02_sfnt_off0000f2bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BB 10752 bytes
SHA-256: 1157d0b314abd0898a96b9f1b016cce5ce03e751bd596b6b0653a12976607255
font_03_sfnt_off0001176e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1176E 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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