Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c1275abf034be5f…

MALICIOUS

PDF

85.4 KB Created: 2021-03-21 23:05:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: edeee9bbe594095c7b6b2a68c3c27c61 SHA-1: b8da81167f19c06015ede4c23a806a1e2c76022b SHA-256: 4c1275abf034be5f905b90fee4c064290fda6d7cc69eb0dd5cbdbb1685c02e68
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to disposable domains and link farms, suggesting a phishing or SEO spam campaign. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly indicate the document's purpose is to redirect users to a network of sites, likely for malicious purposes such as distributing further malware or conducting phishing attacks.

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://dugedepap.ru/123?utm_term=dugola+chaita+video PDF link annotation
    • https://fupejudesomazi.weebly.com/uploads/1/3/4/1/134108974/5936698.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478131/normal_60512914205d0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366676/normal_5ff9d8ab2bbad.pdfIn PDF document text
    • http://xuzudedol.22web.org/imperative_form_meaning.pdfIn PDF document text
    • https://tusixifowidafoj.weebly.com/uploads/1/3/1/4/131437116/3298564.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451027/normal_6046301f49f07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425010/normal_6009cd4407f07.pdfIn PDF document text
    • http://sozikibonoda.iblogger.org/16482612891.pdfIn PDF document text
    • https://pufetebad.weebly.com/uploads/1/3/4/7/134711346/jagijiroga-vefenikuv.pdfIn PDF document text
    • http://rukunikuxajosog.22web.org/zuwitebusiw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466657/normal_5ffe145d36bb8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368949/normal_5fff02d9ea4e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447434/normal_602e7fee4c144.pdfIn PDF document text
    • https://pafutidosuzov.weebly.com/uploads/1/3/5/9/135989867/abb8c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477629/normal_5fffca5158c1f.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
    • https://uploads.strikinglycdn.com/files/0905d6be-e203-49bb-b8f8-51a954586705/31555055865.pdfIn PDF document text
    • http://tupamesazadazop.rf.gd/best_wilderness_survival_gear.pdfIn PDF document text
    • http://pakifisaxere.epizy.com/87781165139.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c535c5f-816f-4ded-97e7-7e491328520b/miniature_dachshund_puppies_for_sale_carmarthenshire.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b256c6a-179e-4999-adb3-62ffd2a1541d/91701492079.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001058f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058F 4760 bytes
SHA-256: 79b725d6c94da63a6798ba970b8259b1e5e829b23f1ed2b90d3372cb1f112f1c
font_01_sfnt_off000115d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D5 10760 bytes
SHA-256: 25d78d5ffb54ed0e8f8d8ace3326c9446cd2881bc44403ea46c1134cae72efcd
font_02_sfnt_off00013a78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A78 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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