Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecbe4f189e40f3ec…

MALICIOUS

PDF

70.7 KB Created: 2020-12-26 01:18:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 8869d2c796646464d368d0259a0b4c21 SHA-1: 8ed1562ace491e92d49bf7a0ddefcaace795d3a5 SHA-256: ecbe4f189e40f3ecd99c059ac49c32543b04c7064e9687193f86a56081191ebb
214 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics as malicious, including a redirector link and a link farm. The presence of numerous embedded URLs suggests an attempt to either phish users or engage in SEO manipulation. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the overall structure points to a malicious document designed to lure users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://traffine.ru/123?utm_term=thick+description+geertz In PDF document text
    • https://cdn.sqhk.co/sepunaro/hjjbjdN/12889745032.pdfIn PDF document text
    • https://mesipaku.weebly.com/uploads/1/3/1/3/131383407/muzusidosizoluju.pdfIn PDF document text
    • https://cdn.sqhk.co/fosasukenum/jietib5/dune_2000_ps1_review.pdfIn PDF document text
    • https://cdn.sqhk.co/joraxeneli/iiKBfB0/spanish_text_for_beginners.pdfIn PDF document text
    • https://kafigibedup.weebly.com/uploads/1/3/4/4/134479504/7007523.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tadovu/gotozogofexigaxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecb05544-ea1a-493b-9fc5-e5a90326eab8/ronizakejobezabawazejopan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24632501-e856-4669-812c-df6691fa8ab7/75417966307.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d037dc2e-eb36-446d-a42e-ae0160da0c9f/52800994379.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9ecac6b-4c8a-419b-ab11-7b206f2972f4/kipapusopujepefow.pdfIn PDF document text
    • https://s3.amazonaws.com/juvosi/xanoveja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66df8a20-141a-48fc-adea-90ac550c99dc/love_boat_guest_stars_today.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_off0000d995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD995 5156 bytes
SHA-256: a7e513f2bb27e2e5748d30d8b92eebea7ef11a8ad3ba1436dcf878ff7620f3b4
font_01_sfnt_off0000eb27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB27 10288 bytes
SHA-256: 8255b13cbd3f9cc8a7190dc6821dfe97f2c3e8e6cf4342f8c5995f84bca042ca

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