Malicious PDF — malware analysis report

Static analysis result for SHA-256 81a311cefea5d725…

MALICIOUS

PDF

85.4 KB Created: 2020-11-13 20:12:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 7b28ca6c968f8faace3e5eb120b4bf7f SHA-1: 061683a207b9e2c2e0b28bda25d479c6e182b94c SHA-256: 81a311cefea5d725b918e18b7c76485e28baa4b68efd6ef7f6b0a84dbbaacc26
214 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to known malicious redirector infrastructure or are part of a link farm designed to manipulate search engine results. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the primary attack vector appears to be the malicious redirection URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffmen.ru/strik?utm_term=rip+my+nigga In PDF document text
    • https://gazesomudari.weebly.com/uploads/1/3/1/0/131070071/rovusuwu_bimuwuxilewivug_sekadelulakara_dafezurajejijat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404975/normal_5f9cc08bb0506.pdfIn PDF document text
    • https://zejaxosadakawur.weebly.com/uploads/1/3/4/3/134372542/sasefakatabeg-tututeboj-xujegaw-powaraz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464302/normal_5fa42834e2053.pdfIn PDF document text
    • https://demogevofowa.weebly.com/uploads/1/3/4/6/134608938/c01196b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365525/normal_5f8a6e6002626.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/rijaliwiguvex/loc_pandas_multiple_conditions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33165d3f-5bec-4c15-a88f-148fcade3778/jojamod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66bcde19-2375-49ed-9487-740c2088f954/91044189632.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/781d4d68-41c8-4015-8b3d-21133eda6115/8550588905.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40c2bcff-7a57-4e04-8f65-2a99d565ab21/mesalamilalon.pdfIn PDF document text
    • https://s3.amazonaws.com/jazofi/50743556105.pdfIn PDF document text
    • https://s3.amazonaws.com/wuzalugiseto/vigedifuviro.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_off00010e86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E86 4940 bytes
SHA-256: cf6c4ba07102d75ed35bf89ce9a45fa0b0b683c9e0037b2a99bcb8871448db49
font_01_sfnt_off00011f5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5C 12684 bytes
SHA-256: f30677acec46afef027ef43bec3a639d995672b74230615c034344ec8489ce89

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