Malicious PDF — malware analysis report

Static analysis result for SHA-256 5423d72c7b3dbecb…

MALICIOUS

PDF

71.5 KB Created: 2021-04-21 13:06:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: f2deed947951e5aff27475c8a88b3358 SHA-1: 7d31a93c7c2ef2d09ba36ef7484c5ed1707bbd6d SHA-256: 5423d72c7b3dbecb52929290c04dc1718922b50f58527ae3ea0a2448829dd1e1
186 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. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm used for phishing or distributing further malware. The embedded content, though heavily obfuscated, appears to be related to a thermostat manual, serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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 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://jumiwimov.ru/strik?utm_term=th6110d1021+honeywell+focuspro+programmable+thermostat PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4384036/normal_6008c9921d3d5.pdfIn PDF document text
    • http://fupefabesosada.mygamesonline.org/learn_japanese_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391314/normal_5fe7728f7a4cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386076/normal_605d581b652e0.pdfIn PDF document text
    • http://rajeziriga.scienceontheweb.net/business_communication_and_management_information_system.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485711/normal_5fd7d020863f5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467573/normal_5ff94791d135d.pdfIn PDF document text
    • http://zovofuti.mygamesonline.org/luvizulamerewotatimim.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a1104102-e7f7-498f-9db5-fd16eb5a1c84.filesusr.com/ugd/3f19aa_58fd71622c5a4fc590e1ae1e88ba8556.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d747562e-ba96-46c4-8247-ceab4efd9838/ley_de_titulos_de_credito_pagare.pdfIn PDF document text
    • https://f05e0dbb-21cf-40ea-8b71-00b8d6f49a3b.filesusr.com/ugd/b09e1d_697e9db4c7284195bde8a0372a2a17a8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/54b44bc6-ed76-4109-8737-abaf36a1d8ce/67655236492.pdfIn PDF document text
    • http://lipeporo.onlinewebshop.net/73601759060.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc7163f5-260f-4a54-9d55-987172a01f22/virgil_aeneid_fitzgerald.pdfIn PDF document text
    • https://7e8267f5-6380-480e-ad72-df526eaefc07.filesusr.com/ugd/cbe325_30bce5431f8b472390b84646fb6b399c.pdf?index=trueIn PDF document text
    • https://9334512a-4df1-45dc-8804-f0fa1d9e2a3d.filesusr.com/ugd/9466eb_784bd68ec95d4fcca874493b1362cce2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8dfe2705-d54a-409c-ac61-c681ff73ef6a/matewiz.pdfIn PDF document text
    • https://550dfcec-0280-4316-a0d5-68b74a7a20b9.filesusr.com/ugd/f59309_7eb8f27b43774c2ea42e900d950db969.pdf?index=trueIn PDF document text
    • http://xutenasejubibe.atwebpages.com/risk_management_journal_articles.pdfIn PDF document text
    • https://e4da1597-3bb3-488b-9226-7c2c9e06e9ce.filesusr.com/ugd/db5d73_4892cafae15547419335406f0ebd7a35.pdf?index=trueIn PDF document text
    • https://6a421494-2577-4416-904f-e17348f56b63.filesusr.com/ugd/85e76a_b0bfb846dc414617b2a59a1ad261fbd0.pdf?index=trueIn PDF document text
    • https://60659a61-a27b-47ea-8eac-a81775c62269.filesusr.com/ugd/7a7fb1_b46b08294d464e6cb42b664ea29cf822.pdf?index=trueIn PDF document text
    • https://51f47fa2-20f7-4ec4-bb91-8ae4aee689b4.filesusr.com/ugd/917232_0cb35258b6ed4a45943ca22d6d76d68c.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_off0000d59c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD59C 6332 bytes
SHA-256: a48bf069261a3889a7d1b78efc76855ec06c5ffd989eed65963f856851aac103
font_01_sfnt_off0000eb1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1F 10880 bytes
SHA-256: 12d758fc11f313a6ba5ea820d19161506f9689eac532b670ef6416952bf78f69

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