Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b7a833ed4eb1f9a…

MALICIOUS

PDF

86.5 KB Created: 2021-06-04 15:25:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 0450c4a76d113901f5749f5a05a70d88 SHA-1: 54574fcdc844c67a160bc12f621695d950f8d170 SHA-256: 6b7a833ed4eb1f9a775e78b2dfc5d55078aa87aef7a7d4ba13219cc681b6335c
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with a significant number pointing to disposable hosting and utilizing UTM parameters, indicative of a link farm designed for phishing or malware distribution. ClamAV and ML classifiers strongly flagged this file as malicious, specifically as a phishing trojan. While no scripts were extracted, the heuristic findings and the sheer volume of suspicious links suggest the primary attack pattern is to redirect users to malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://wastran.ru/pbw?utm_term=la+lengua+de+las+mariposas+manuel+rivas+analysis PDF link annotation
    • https://static.s123-cdn-static-d.com/uploads/4418991/normal_60b77ca0d563d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445333/normal_5fed66246153e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470696/normal_604e467ee171e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411691/normal_604491bf3a8e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459937/normal_606b9a86a899d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449779/normal_606e03956821f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366344/normal_6013217a8e5c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385633/normal_604d1a73b285f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477167/normal_5fd5ffdbd1e3b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pebenuziwi.pbworks.com/w/file/fetch/144548232/phoenix_securecore_tiano_setup_uefi.pdfIn PDF document text
    • http://ridelox.pbworks.com/f/best_parking_simulator_ios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0b2eca7-4c01-4539-bd25-a62f7f4f87fe/what_is_science_book.pdfIn PDF document text
    • http://kigiputilik.pbworks.com/w/file/fetch/144608889/tik_tok_app_download_apkpure_in_jio_phone.pdfIn PDF document text
    • http://zewalar.pbworks.com/w/file/fetch/144463911/71883357366.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6278c806-6925-4098-9c39-b921038b236c/10971322250.pdfIn PDF document text
    • http://xujefix.pbworks.com/f/31831124622.pdfIn PDF document text
    • http://sajateves.pbworks.com/w/file/fetch/144470424/vumufizisexefel.pdfIn PDF document text
    • http://duziruromeja.pbworks.com/w/file/fetch/144508497/20102425790.pdfIn PDF document text
    • http://mupalunava.pbworks.com/f/preliminary_design_document_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7613455a-fb65-4dba-b6c0-f00a935e16ce/52013463667.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc33ca16-175a-4e23-97f2-109a3431c86a/joneriravekijunixuzefas.pdfIn PDF document text
    • http://pugaxigodaka.pbworks.com/w/file/fetch/144473073/97188492662.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_off0001100a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1100A 5384 bytes
SHA-256: 82483c7199754f8ccb7de89840dd498b4d923340d757a9fc5a9df7cb4e549215
font_01_sfnt_off00012250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12250 12684 bytes
SHA-256: 2e2852320ac7c6c6ddfe9ce1cd85a787e40ec1cdd6e39cd8c48468db29c5dda4

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