Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5c0b5f76b15149c…

MALICIOUS

PDF

85.3 KB Created: 2021-02-23 18:44:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 6071c75b2fc31d4349e4ddcd4110a3b9 SHA-1: 1ba9b8196ff49ce39c5b92600333d5acef9b5bbd SHA-256: f5c0b5f76b15149c19839c4c9903536bd91617a9a7c845d1e887e69db3994ffb
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

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 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.
  • 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://leonvi.ru/strik?utm_term=how+to+clean+a+masterbuilt+gas+smoker PDF link annotation
    • https://mabavelege.weebly.com/uploads/1/3/0/7/130775551/752f5f224f82.pdfIn PDF document text
    • https://cdn.sqhk.co/bosamame/ZIKjghS/68690199601.pdfIn PDF document text
    • https://cdn.sqhk.co/miseseren/f4ie7yh/stylit_dress_up_styling_game_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/puxezuxivas/V5hacgg/silebejuvuguwuvaz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417220/normal_5fe244c3f2956.pdfIn PDF document text
    • https://cdn.sqhk.co/kopubeno/L5jbJlQ/can_tor_browser_leak_mac_address.pdfIn PDF document text
    • https://cdn.sqhk.co/lozuzupadis/icifUnH/23708632143.pdfIn PDF document text
    • https://lilususuki.weebly.com/uploads/1/3/4/3/134317990/b54cd1c75cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424036/normal_601863b3c1551.pdfIn PDF document text
    • http://sazijewu.iblogger.org/pebedapodap.pdfIn PDF document text
    • https://luzatewuxajexi.weebly.com/uploads/1/3/4/2/134265782/levegesoduno.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483081/normal_5fd18f409c375.pdfIn PDF document text
    • https://cdn.sqhk.co/jopubelo/jaChejk/27093663104.pdfIn PDF document text
    • https://dibekojiworibo.weebly.com/uploads/1/3/1/6/131637919/063b7b40750.pdfIn PDF document text
    • https://cdn.sqhk.co/nizivatitogu/iViejgX/xuboto.pdfIn PDF document text
    • http://kawolamekepe.22web.org/35409517792.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366973/normal_5ffd00ed8a981.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://batefagut.epizy.com/85444466994.pdfIn PDF document text
    • http://vogojitipam.epizy.com/bajrangbali_ka_photo.pdfIn PDF document text
    • http://tupibamogowoful.rf.gd/97333908236.pdfIn PDF document text
    • http://zasegusof.epizy.com/58465314617.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B9 5376 bytes
SHA-256: 8f88a4d927f1359d008b9dae4aba3f593565465e88b1cd5de70c84a115321c90
font_01_sfnt_off00010a02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A02 11840 bytes
SHA-256: 23bcb72626539ebd877b40260d2890dda3560651147144062d736770178748fa
font_02_sfnt_off000131e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131E3 16188 bytes
SHA-256: dbd025f172c922c366824e5c436e0f60965002803d652913eda56d805321d196