Malicious PDF — malware analysis report

Static analysis result for SHA-256 d314c52a0487a2ad…

MALICIOUS

PDF

83.9 KB Created: 2021-03-02 07:34:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 50d771ecec219289ed770274f73463b0 SHA-1: 7fc81e220a91881280b526742f6eee08f94438a0 SHA-256: d314c52a0487a2ad369ed9d63d8088dc7c64f0edfeca34d46125b55bcea063e7
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, with one URL pointing to 'nipisod.ru'. The ML classifier and ClamAV strongly indicate maliciousness, classifying it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest it's designed to redirect users to potentially malicious sites, likely for phishing or malware distribution.

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://nipisod.ru/strik?utm_term=dell+latitude+e6530+specs PDF link annotation
    • https://cdn.sqhk.co/veletafi/hbifDG5/las_vegas_vacation_packages_from_new_york.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459337/normal_5fe74c177ca6d.pdfIn PDF document text
    • https://cdn.sqhk.co/vimanagadu/Ljiijge/robot_superhero_champions_mod_apk_1._0._54.pdfIn PDF document text
    • https://cdn.sqhk.co/zejizoguzut/ic7hjAl/60595732636.pdfIn PDF document text
    • https://tarofojazen.weebly.com/uploads/1/3/4/2/134235484/xidokujuv_buvoxunapeduxaw_juvibajatu_kezisizog.pdfIn PDF document text
    • http://pimifawimonidij.mywebcommunity.org/29955676098.pdfIn PDF document text
    • http://tonevagewalilu.medianewsonline.com/dr._robert_sapolsky_stress.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461245/normal_5ffb6f82bf6cc.pdfIn PDF document text
    • https://xogepojofaridel.weebly.com/uploads/1/3/2/7/132741214/de200d.pdfIn PDF document text
    • https://cdn.sqhk.co/kogujipubap/ha8dcjf/dfo_forgotten_land_guide.pdfIn PDF document text
    • https://pebenari.weebly.com/uploads/1/3/4/5/134518206/lozoninopuzuro.pdfIn PDF document text
    • http://tanifulumu.iblogger.org/girakunigu.pdfIn PDF document text
    • http://tukameduk.22web.org/soralo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474220/normal_6033fa90c5e7c.pdfIn PDF document text
    • http://lazujifoxupa.getenjoyment.net/95613719625.pdfIn PDF document text
    • https://cdn.sqhk.co/wepunajexiju/icjcxia/otogi_spirit_agents_characters.pdfIn PDF document text
    • https://voruvagozi.weebly.com/uploads/1/3/4/7/134742827/pagivemekux.pdfIn PDF document text
    • https://xivilikowigonun.weebly.com/uploads/1/3/0/8/130813923/bf2af4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://litopuputorer.rf.gd/69399293886.pdfIn PDF document text
    • http://kiduxoz.epizy.com/zobixuf.pdfIn PDF document text
    • http://weralawubuzeg.epizy.com/applied_mathematics_3_information_technology.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_off00010173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10173 5556 bytes
SHA-256: 181527a05bb59e45398140335b85961fa5f894cbd402b0fbf13ff959f76dd7cf
font_01_sfnt_off0001146e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1146E 16012 bytes
SHA-256: ff7f1a5f20d3a5e94a84fe91a558619384e89d642e30905e2cf00915d89c3041

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