Malicious PDF — malware analysis report

Static analysis result for SHA-256 713d637a1810f52d…

MALICIOUS

PDF

75.1 KB Created: 2021-03-23 02:21:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: e8137f51aaca7423d75b64c1aa37cb00 SHA-1: 25816ee89bb38e7f572d7ceb8f5db91229e84a7e SHA-256: 713d637a1810f52d138be37aee95446b6412563d25569951e021277c16fc95aa
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing trojan. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing campaign. The document body is heavily obfuscated and unreadable, but the presence of embedded URLs and the heuristic findings strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://pelibifir.ru/strik?utm_term=how+many+grocery+store+workers+get+covid PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4479705/normal_5fda80b6e335e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376598/normal_5fffcf5a789d6.pdfIn PDF document text
    • https://nivakodet.weebly.com/uploads/1/3/4/3/134330266/zusubunigevipozu.pdfIn PDF document text
    • https://cdn.sqhk.co/famogidoje/ncWTGIS/zokeli.pdfIn PDF document text
    • https://guditeni.weebly.com/uploads/1/3/4/5/134529862/teteped-lilurolem.pdfIn PDF document text
    • https://cdn.sqhk.co/jejekije/Ohjge2W/toxowagirefozir.pdfIn PDF document text
    • http://kuwanusefunok.iblogger.org/google_drive_folder_python.pdfIn PDF document text
    • https://dugizixenopiloj.weebly.com/uploads/1/3/4/4/134457585/lijabogezozove-vilemaviponodu-ketoxur-xitikogulame.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423148/normal_5fe74cd9144d5.pdfIn PDF document text
    • https://nifirasevaxo.weebly.com/uploads/1/3/4/7/134756957/698772.pdfIn PDF document text
    • https://cdn.sqhk.co/noviraxat/GMiiZYv/14719886236.pdfIn PDF document text
    • https://soxapibojewaw.weebly.com/uploads/1/3/5/3/135345372/tofefisexavupanifi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e52bf855-798f-486c-9693-ec6fee6331c0/can_you_track_a_usps_package_in_canada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6f91560-2a36-4ea9-8a05-3e786fb8a0f4/xebekunomixap.pdfIn PDF document text
    • http://gozajogef.rf.gd/7962213798.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c972aa41-4b1d-40a4-b647-91817128837d/kibizizipesepokebiker.pdfIn PDF document text
    • https://da99f664-88c7-4a27-98aa-0bbcec2e8f57.filesusr.com/ugd/66f3f9_e276dddb1e5c47459c7f3050d609cfa7.pdf?index=trueIn PDF document text
    • http://talamilikobapi.epizy.com/gelalafupubaven.pdfIn PDF document text
    • https://05f6fcc2-a4c7-4d5b-b58c-97b640a93f4d.filesusr.com/ugd/74147a_7f8fa80769f54608a1ba2e38a75bdbc4.pdf?index=trueIn 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_off0000e49e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49E 5504 bytes
SHA-256: 200d58e9c73e5d8f914fd4e415c1124eecd183b72b49996e55e45a242354b8b9
font_01_sfnt_off0000f75a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75A 11200 bytes
SHA-256: fd90ddd95e7207d9a790cebcb9ac76f794cc388b6c6ca02349be340fe93e0cb8

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