Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ca82e82144be9d5…

MALICIOUS

PDF

74.4 KB Created: 2021-05-29 08:28:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ac799cee79724c7f5673aa467e0b9e3e SHA-1: 5e62741faff4d48921b7527a85aeb4b12f133085 SHA-256: 3ca82e82144be9d56dc8cd181028be4de021e4ec8cae86c2dfaddef3e1bdc6b3
176 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to PDF files, suggesting a link farm or phishing attempt. The 'SE_CALLBACK_LURE' heuristic indicates a potential callback phishing or tech-support scam. While no scripts were extracted, the ML classifier and ClamAV detection strongly suggest malicious intent, likely involving exploitation of a PDF vulnerability to redirect the user to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/123?utm_term=wealden+building+control+application+form
    • https://static.s123-cdn-static.com/uploads/4466175/normal_5fff5454174ae.pdf
    • https://xukobali.weebly.com/uploads/1/3/4/8/134882082/b8e6bf734.pdf
    • https://cdn-cms.f-static.net/uploads/4368950/normal_6045fe05ec5f8.pdf
    • https://cdn-cms.f-static.net/uploads/4446925/normal_5fe9f25a2e6ca.pdf
    • https://cdn-cms.f-static.net/uploads/4379046/normal_5fd1152de8185.pdf
    • https://xugubevowasisof.weebly.com/uploads/1/3/4/8/134885616/gabiwutiwif-lanomaj-vokol-musukukivodena.pdf
    • https://static.s123-cdn-static.com/uploads/4426830/normal_5ff768fb0677a.pdf
    • https://static.s123-cdn-static.com/uploads/4451766/normal_60031f1450bdf.pdf
    • https://vevitukag.weebly.com/uploads/1/3/7/5/137506107/biwulotume-wiwumimuzeb-besazexo.pdf
    • https://cdn-cms.f-static.net/uploads/4388412/normal_605f751b1cf6e.pdf
    • https://pezilesuwubev.weebly.com/uploads/1/3/4/6/134639222/zisumod_nixewi_xavamekugiteg.pdf
    • https://zogazipo.weebly.com/uploads/1/3/2/3/132303407/503b72.pdf
    • https://static.s123-cdn-static.com/uploads/4414498/normal_5fcd300b25f4e.pdf
    • https://jaligudupu.weebly.com/uploads/1/3/5/3/135391073/tibilemagag_sivekakoxujir.pdf
    • https://sofofiwolasaxu.weebly.com/uploads/1/3/1/8/131856039/misubo_wudafemilun_roxobuvivapidu.pdf
    • https://cdn-cms.f-static.net/uploads/4374843/normal_600e1171cbcdc.pdf
    • https://mosuvixixe.weebly.com/uploads/1/3/0/9/130969854/1551278.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/df7f38fe-1888-41f0-a477-1dafedf0e28a/mazabimopolixifar.pdf
    • https://uploads.strikinglycdn.com/files/030ca874-9279-480d-8af0-c10ae61db93c/stick_fight_archer_mod_apk_unlimited_money.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4f9.bin
3ecc6c4efb3517d40a14e43892811805d4e2fd6bbcc6cc31597b9cf02917a13d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F9 5452 bytes
font_01_sfnt_off0000f779.bin
2a2cd14390072fecaf5db344dcf1bc38fc27f2ab75eed5faafbb3138bb4ca0dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF779 10792 bytes

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