Malicious PDF — malware analysis report

Static analysis result for SHA-256 df0fc2cdeb2ff97a…

MALICIOUS

PDF

88.3 KB Created: 2021-04-17 22:23:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 714a4e4368747a74c9deabda8f5268fa SHA-1: 0c65572f83c2a385df9e57beab76406a943918fa SHA-256: df0fc2cdeb2ff97a53fb61c530fa7548aedb3633bfd632549b2ca42af4645ba9
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded URLs and is flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious phishing content. The document body, though heavily obfuscated, suggests a lure related to Samsung washing machine error codes, which is used to entice users to click on the malicious link. The presence of numerous external links on disposable hosting further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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 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://baarspo.ru/strik?utm_term=samsung+front+loader+washing+machine+error+codes+5e PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485591/normal_603517f7418a0.pdfIn PDF document text
    • https://xixafaxuxux.weebly.com/uploads/1/3/4/3/134340403/0acf97.pdfIn PDF document text
    • http://oneitstore.info/58636784619a5att.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447630/normal_6022153434252.pdfIn PDF document text
    • https://dodanopo.weebly.com/uploads/1/3/1/4/131408738/jowex.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459796/normal_5fc88ed6d3f0c.pdfIn PDF document text
    • http://kususupodaw.22web.org/beginner_classical_piano_sheet_music.pdfIn PDF document text
    • http://temppicture.xyz/tcp_ip_protocol_suite_solution_manual_free_downloadk51jj.pdfIn PDF document text
    • http://fazudoladuvegig.22web.org/91750970551.pdfIn PDF document text
    • http://complect-tech.ru/wuzutunexemufoxogu00f5e.pdfIn PDF document text
    • https://virenogapugutu.weebly.com/uploads/1/3/4/6/134635416/mabazulufi.pdfIn PDF document text
    • http://fuzinitadovas.22web.org/buxaxixejolaziwup.pdfIn PDF document text
    • https://zomoxiwoginu.weebly.com/uploads/1/3/1/6/131637743/e745fa3cf1eea.pdfIn PDF document text
    • http://depalowivejal.iblogger.org/17588118651.pdfIn PDF document text
    • http://vash-fasad.live/zusepogomadaruvinigegefomqm66y.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381988/normal_5fe87fbbac2e8.pdfIn PDF document text
    • http://mmuuue.space/riwotidugukefejisuxudavakyjh7t.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gebukil/2619195173.pdfIn PDF document text
    • https://s3.amazonaws.com/vufuzewasi/how_do_i_create_a_training_plan_in_excel.pdfIn PDF document text
    • http://parezorizujax.rf.gd/kizegagapapavebo.pdfIn PDF document text
    • http://renawexit.epizy.com/how_much_does_a_computer_programmer_earn_uk.pdfIn PDF document text
    • http://zowedejiwut.epizy.com/niguvoketazab.pdfIn PDF document text
    • http://ruxududomaba.epizy.com/47148533995.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_off000118cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118CB 5756 bytes
SHA-256: 00c8358b30a2d7797081627d7a85265927161fe13919e83172314ee374144e5f
font_01_sfnt_off00012c4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C4D 11772 bytes
SHA-256: a439cfe0e982352543e1c4681ef0306081e2f6091f9e4994f578c0e8b1d826bd

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