Malicious PDF — malware analysis report

Static analysis result for SHA-256 928b1e4e5c84e40c…

MALICIOUS

PDF

85.8 KB Created: 2021-04-22 21:27:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9f96680439fb340f5912c6f0f817ff44 SHA-1: 92230b3400274d784e28d4bd925a07b54edbc5e1 SHA-256: 928b1e4e5c84e40c33baf36423ea1dfef9d696f0871452a90ebd8bcfb115a2fa
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://bologen.ru/strik?utm_term=deluxe+precision+sewing+machine+made+in+japan PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4428035/normal_6056ab2beeb48.pdfIn PDF document text
    • https://cdn.sqhk.co/libobivole/CjaJ3hd/gokemekimavi.pdfIn PDF document text
    • http://vijoxufomodazug.22web.org/wudipitobipulu.pdfIn PDF document text
    • https://cdn.sqhk.co/depadukat/jhdzLxN/defavedogebed.pdfIn PDF document text
    • https://cdn.sqhk.co/kalusoxat/gcf5hhn/tiny_christmas_village_houses.pdfIn PDF document text
    • https://gajokemijibefe.weebly.com/uploads/1/3/4/4/134467094/gomenateg_rafosirixem_rabodu_duvuj.pdfIn PDF document text
    • https://cdn.sqhk.co/lagazowasobo/diba9fI/trials_frontier_hack_apk_2018.pdfIn PDF document text
    • https://xizovetezewo.weebly.com/uploads/1/3/2/8/132814166/xunitesisor_kugunu_sopije_gonikawugo.pdfIn PDF document text
    • https://cdn.sqhk.co/moturalogupe/QhiCBte/jungle_marble_blast_2.pdfIn PDF document text
    • https://cdn.sqhk.co/guvelebul/cjjicig/beginning_paragraph_correction_1_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/fikalibumi/Npibgjl/almost_there_clarinet_sheet_music.pdfIn PDF document text
    • https://komidozikozapuf.weebly.com/uploads/1/3/1/4/131455883/4400f6ac.pdfIn PDF document text
    • https://cdn.sqhk.co/luginuwi/jgvhfie/12193631692.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405907/normal_602f480a35944.pdfIn PDF document text
    • https://cdn.sqhk.co/dugabolisuma/tibljh8/hmrc_payment_online_self_assessment.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tivozabalilibo.rf.gd/yield_strength_and_tensile_strength.pdfIn PDF document text
    • http://refewebol.epizy.com/amigos_para_siempre_nuty.pdfIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/dixit_cards_game.pdfIn PDF document text
    • https://s3.amazonaws.com/tikofaketonub/feramilenezeruwalevenaper.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_off0001103f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1103F 5720 bytes
SHA-256: 4aa6153aaa7abc0630ab787b05bf14cc1c93c14ad9b0d6225ff360192b69af5b
font_01_sfnt_off000123a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A6 10796 bytes
SHA-256: ab42297f20554e2e20196e463c903274a2cd69efdad5ae38830efcd2fc1b0425

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