Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a4065d5b993cb8f…

MALICIOUS

PDF

86.1 KB Created: 2021-03-20 11:09:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 128a6984ff3990196beed1c099393ca8 SHA-1: 52050ab3eeda1e3e97832f4d0abbe5a0c628a7a3 SHA-256: 6a4065d5b993cb8f37e00011cb110e4b67ab870e826a260106209c73634f647b
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

The PDF document contains numerous external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content likely prompts the user to install a browser extension or update, a common social-engineering technique. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. No scripts were extracted, but the embedded URLs and link farm behavior are strong indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://ponafet.ru/award?keyword=articles+on+entrepreneurship+and+innovation+pdf PDF link annotation
    • https://cdn.sqhk.co/bezakebijuk/cSVsLgj/44343118775.pdfIn PDF document text
    • http://fredo.run/stick_ranger_wiki_classesekpnf.pdfIn PDF document text
    • http://fringigejy.site/quantitative_methods_for_business_david_r_andersonjkufh.pdfIn PDF document text
    • http://pro-konditer.com/bamixagutescdyy5.pdfIn PDF document text
    • https://cdn.sqhk.co/lazuxorus/Sgdaxii/29010050520.pdfIn PDF document text
    • http://ejqy.com/46198474113kud7s.pdfIn PDF document text
    • http://winoorama.site/hedgehog_corner_bookmarkh3up3.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/c6e7a98d-2339-4907-b838-f795a103f208/is_the_lovely_bones_on_netflix_canada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8be3fad-c6de-436b-beb3-a995cc66957b/innova_3130e_scan.pdfIn PDF document text
    • https://a40b6db0-1679-4e03-879f-ac5827b9aa7d.filesusr.com/ugd/dba42a_b9155854e1eb46dfb1035cb282f600d0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pusori/76221306424.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d2121c7-a3ce-47cd-baf0-3ec9aed0d733/understanding_human_sexuality_free.pdfIn PDF document text
    • https://s3.amazonaws.com/petubapizo/zewosemisawolot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b322a17-a977-40b7-bf87-33752f82f2d6/93571843934.pdfIn PDF document text
    • https://f0198b83-f3fe-41b4-8315-bacd7eabb238.filesusr.com/ugd/2b3f46_2a75d2bf4cb74907adb3bad653dc0ed0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/22971347-7646-4b83-ba0a-632af5cb58ad/wikegog.pdfIn PDF document text
    • https://s3.amazonaws.com/lixasifasi/hyaluronic_acid_gel_sheet_mask.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_off00010361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10361 5172 bytes
SHA-256: eabdeff5b581628733e01614404afd00bd17c6267e8877a2b4c7d13e0ca13ec2
font_01_sfnt_off000114eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114EB 12352 bytes
SHA-256: 100590d467fbcf94f038734bd5e35e792929ec44414c956c15f919dd3adecf66
font_02_sfnt_off00013cb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CB5 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34