Malicious PDF — malware analysis report

Static analysis result for SHA-256 79a70632c4132bf4…

MALICIOUS

PDF

70.4 KB Created: 2021-04-06 00:49:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6f4723227327bb5b270ed994c9094438 SHA-1: 1a20694abff3b72ba9e0023a80a487271e8fa434 SHA-256: 79a70632c4132bf482f1594ecb54e4e79e982bedc1f1e898b7f95550986ac0a2
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-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://zajinet.ru/strik?utm_term=kitchenaid+stand+mixer+cover+blue PDF link annotation
    • https://cdn.sqhk.co/pepegejivo/gcifiiy/pirates_of_the_caribbean_theme_song.pdfIn PDF document text
    • https://cdn.sqhk.co/veladaxuzeba/Bhcifgj/136231091.pdfIn PDF document text
    • http://islemleriniz.org/30501039183uwavw.pdfIn PDF document text
    • https://cdn.sqhk.co/bipobulif/hcQjctd/dekuberenabopozogi.pdfIn PDF document text
    • https://cdn.sqhk.co/sutazojawote/eSijRYp/super_truck_racing_ps3.pdfIn PDF document text
    • https://cdn.sqhk.co/suxupijisajo/eageSNS/love_rosie_soundtrack.pdfIn PDF document text
    • http://trudogoliya.online/fce_reading_use_of_english_part_4mmov1.pdfIn PDF document text
    • http://natfreshik.fun/spring_framework_4.3_documentationxc9ke.pdfIn PDF document text
    • http://zespodsvetkoy.site/precalculus_mathematics_for_calculus_7th_edition_answerswg6gd.pdfIn PDF document text
    • http://nickned.me/babafisejixehz1c7.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/942b4860-f326-4c23-9be6-27d08e315aba/98066017184.pdfIn PDF document text
    • https://s3.amazonaws.com/sazomo/a-_z_south_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/bestwap._in_movie_2018_hd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/430fe3cd-56a5-4b0f-ab23-6c4bafcdbd8a/toyota_camry_hybrid_repair_manual_2007.pdf.pdfIn PDF document text
    • https://7fe1f042-206b-4735-a408-f56337efeeb4.filesusr.com/ugd/d34b51_e59c7f993448402b908c5c39f0df086e.pdf?index=trueIn PDF document text
    • https://a0bbd489-bf03-48a0-8e93-88abd0751e5b.filesusr.com/ugd/370ea2_a1bf0bf52e6a47b38329418d5424175c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cee20766-db3c-4a0e-8992-f7f20ff22a60/chronicles_of_narnia_the_lion_the_witch_and_the_wardrobe_summary.pdfIn PDF document text
    • https://6c49ff76-e13b-46da-8354-2e633d56f736.filesusr.com/ugd/211c2d_389381164b25479fa43124f9728876c8.pdf?index=trueIn PDF document text
    • https://203aa715-7352-46b1-b16b-5d0aeeaa27a2.filesusr.com/ugd/0582e0_77194c310127452183be5556d36ec6dd.pdf?index=trueIn PDF document text
    • https://5fdaa9e0-ad6d-443b-8779-beb8e45026dc.filesusr.com/ugd/05301a_52d3bce431b14489b98028c5432b18ff.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_off0000d1dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1DD 5416 bytes
SHA-256: f88dd0f7e95d35bf0e9442694209d8eafa431d1c50ece366bf15673d1f5ea9d9
font_01_sfnt_off0000e426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE426 11424 bytes
SHA-256: 973b1f480b3f653c5164e9c09e1668556a3a7dee1824e457b95753bfdf4ad004

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