Malicious PDF — malware analysis report

Static analysis result for SHA-256 245a0639e5ac731b…

MALICIOUS

PDF

78.2 KB Created: 2021-02-23 22:51:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: db0681878015c99aadeb912e1779388e SHA-1: a4a8ab9f55651bd259a1245cc76e30048503524f SHA-256: 245a0639e5ac731b40e8f02153440b0386be4879807c397ac9cd0b471489f326
254 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a phishing or malware distribution lure, evidenced by numerous embedded links pointing to potentially malicious redirectors and content farms. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the sheer volume of external links suggest an attempt to lead users to harmful sites. The 'SE_SECURITY_BYPASS' heuristic further indicates malicious intent by instructing users to disable security measures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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 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.
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://crophysi.ru/strik?utm_term=manual+router+linksys+wrt120n+espa%25C3%25B1ol In PDF document text
    • https://cdn.sqhk.co/gajeneset/ggihAjd/juxesulezaxamafixa.pdfIn PDF document text
    • http://nofovukad.iblogger.org/panivodizabupave.pdfIn PDF document text
    • https://cdn.sqhk.co/kerutadit/hidEtvD/run_run_rudolph_kelly_clarkson_dance.pdfIn PDF document text
    • https://pofuzopabo.weebly.com/uploads/1/3/4/3/134307265/tetobalopujulafanal.pdfIn PDF document text
    • http://infokurs.design/84633714558e8ypq.pdfIn PDF document text
    • https://lofidebonejiniz.weebly.com/uploads/1/3/5/3/135334880/2217d3.pdfIn PDF document text
    • https://cdn.sqhk.co/giwibilawa/djfsg2x/91028484797.pdfIn PDF document text
    • https://cdn.sqhk.co/ganuniwiku/ahfihii/gravity_blanket_cooling_duvet_cover.pdfIn PDF document text
    • https://cdn.sqhk.co/xadakede/ijjeuMI/zivadunutifesabemiw.pdfIn PDF document text
    • https://tirotirow.weebly.com/uploads/1/3/1/3/131380420/ruvujesiporixoj-satib-xilitot.pdfIn PDF document text
    • https://cdn.sqhk.co/kupawusel/hcWhhAK/siwapikeze.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://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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EA 5496 bytes
SHA-256: 2a7f0be5f284dc28a834590dcd0419bd71f5ae7f022665c6bb8145879a5ef457
font_01_sfnt_off0000f57d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57D 11516 bytes
SHA-256: d9f9ba828295677679b1d2ba0f47c4a7622b3b376c603f2632ad0b294efdf8e1
font_02_sfnt_off00011b88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B88 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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