Malicious PDF — malware analysis report

Static analysis result for SHA-256 1237d14f80a909ec…

MALICIOUS

PDF

70.2 KB Created: 2021-03-02 23:43:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 3f0476535cc24621773a338c3dc8b833 SHA-1: ccb85ef9df71336a2da8c11d93c61cd42d1ef24f SHA-256: 1237d14f80a909ec49f36a6ad31e5f56ae277e5c0d4df664365e3d01e38e906d
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous embedded URLs pointing to disposable domains and link farms, suggesting a phishing or malware distribution campaign. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity, likely leveraging embedded JavaScript for redirection or exploitation.

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
  • 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://jumiwimov.ru/123?utm_term=baby+goats+jumping+and+playing PDF link annotation
    • https://dutaveporope.weebly.com/uploads/1/3/4/6/134600224/bugefigekufer.pdfIn PDF document text
    • https://bafumujem.weebly.com/uploads/1/3/4/4/134498711/foxavutopepexox.pdfIn PDF document text
    • https://xirejefeju.weebly.com/uploads/1/3/4/7/134723985/67f9df4f57.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374368/normal_6020afefb824d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484612/normal_602dcafe7548c.pdfIn PDF document text
    • http://legionmone.xyz/695901063693s2io.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426558/normal_6026b4c2a3b54.pdfIn PDF document text
    • http://bagerisevi.scienceontheweb.net/tulilufewumagarapi.pdfIn PDF document text
    • http://bumawusuka.mypressonline.com/29688726863.pdfIn PDF document text
    • https://ragurinibobuma.weebly.com/uploads/1/3/3/9/133986244/c99966ef9.pdfIn PDF document text
    • http://bikejesoxatelo.mygamesonline.org/wofepegovexupe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495059/normal_5ffa372c6fa16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485309/normal_601b4ac3a82ba.pdfIn PDF document text
    • http://bebetadiruj.mywebcommunity.org/tifefibitubudazubur.pdfIn PDF document text
    • http://obsluzhivanie-kompyuterov.moscow/cisco_dpc3941t_wifi_speedpxgt2.pdfIn PDF document text
    • http://raisinslabs.club/24742373920eyz3w.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fexewon.rf.gd/dead_cells_biomes_guide.pdfIn PDF document text
    • http://tuwutexo.onlinewebshop.net/websters_third_new_international_dictionary_unabridged_online.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_off0000d45a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD45A 5552 bytes
SHA-256: 52474261d20bd0769f700fd731ec6dfb21b31deda50fa3abe5ea42e6382b85aa
font_01_sfnt_off0000e737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE737 10720 bytes
SHA-256: 5cf1ed31cf7d3e664f6d61b29dcab78f030c67f2a66856e005729b504a58c258

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