Malicious PDF — malware analysis report

Static analysis result for SHA-256 db62ca08b45b45f9…

MALICIOUS

PDF

70.6 KB Created: 2021-05-07 21:34:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: cdae611a05d71b6b17152e4bdc9b9c24 SHA-1: 3984c2d5e7c28cad4bca6d90b98d0145df01a949 SHA-256: db62ca08b45b45f960d4295f53155a6fcd216b840dc0822cd2d203731e86068d
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/strik?utm_term=panasonic+viera+tv+remote+codes PDF link annotation
    • http://testvvd.xyz/kemeweimkow.pdfIn PDF document text
    • http://xeverekenov.22web.org/lysol_all_purpose_cleaner_sds_sheet.pdfIn PDF document text
    • https://cdn.sqhk.co/jivonaxadu/dzZy5uH/ku_basketball_throwback_jerseys.pdfIn PDF document text
    • http://narosisebono.22web.org/rupediravaliwapodopulumo.pdfIn PDF document text
    • http://ayazshabutdinov.club/vanutugufublai99.pdfIn PDF document text
    • https://cdn.sqhk.co/detatakev/jggj4ie/police_sounds_in_words.pdfIn PDF document text
    • http://pivowave.iblogger.org/bacterial_analysis_of_water.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vevojadiren.epizy.com/chair_3ds_max_model_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f397c650-b0a9-40f6-94e5-970153438708/what_is_worley.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3b90177-7953-4046-b174-58275fd140b1/namexenowo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06015221-c040-444e-8af8-5b8e4f8b79d6/sefer_raziel_hamalakh_english.pdfIn PDF document text
    • http://regaguw.rf.gd/purpose_of_a_restaurant_general_manager.pdfIn PDF document text
    • https://ded05c8b-f0d8-42bc-a64b-daa0b63394ca.filesusr.com/ugd/99afdc_92332d9212d44fd781bc357972aae804.pdf?index=trueIn PDF document text
    • http://xuzujokavagud.epizy.com/how_to_make_a_vr_video_with_iphone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b902296-4a70-417d-9ebb-c6436610e410/fuzasigafezenoxiwadusemov.pdfIn PDF document text
    • https://47c0d0ed-94e3-447f-940a-e265262d053f.filesusr.com/ugd/a43ec6_9d4813008c764016a154ca3f6c55e531.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_off0000d83f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83F 5112 bytes
SHA-256: a6ce7f7dbf421db14aa1ad47ec4e174263bc07c9abdb120893b76db13f6377d7
font_01_sfnt_off0000e992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE992 10460 bytes
SHA-256: 8e6042d8892897a94f2acd03f77eaa5bb280549eb866ffa57d13820254951794

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