Malicious PDF — malware analysis report

Static analysis result for SHA-256 800c4e7c95902a2b…

MALICIOUS

PDF

80.2 KB Created: 2021-03-04 01:28:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7ef6041fa4b9840c0994c6d8cdb6acff SHA-1: 4b87e0e4359ab30bb3cdd97611b319ca694f9414 SHA-256: 800c4e7c95902a2b937589053e908cdcfa44f5a41bdadd3e0b14a52997450758
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDFs hosted on various domains, many of which appear to be disposable or low-reputation. This behavior is indicative of a link farm designed to distribute malicious content or conduct phishing. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

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://resalured.ru/wix?keyword=scientific+notation+puzzle+worksheet+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4477401/normal_603caeaec5abd.pdfIn PDF document text
    • https://cdn.sqhk.co/dawiredi/Fqij1hi/24409349222.pdfIn PDF document text
    • https://cdn.sqhk.co/wazafepel/2hglQhe/27070551761.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406806/normal_602d059f1f6bf.pdfIn PDF document text
    • http://vafakewa.iblogger.org/telezanorewilujufaxosurux.pdfIn PDF document text
    • https://luzepomi.weebly.com/uploads/1/3/1/8/131856518/zevalozasebitusaxi.pdfIn PDF document text
    • https://cdn.sqhk.co/wojusipi/Qkjd70o/unblocked_games_76_slope_2_player.pdfIn PDF document text
    • https://cdn.sqhk.co/jutusaxibu/9jhNdge/23699624609.pdfIn PDF document text
    • https://cdn.sqhk.co/duloputemab/hifjgie/infection_the_invasion_begins_movie.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375708/normal_60142cf9683d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377407/normal_603554422e412.pdfIn PDF document text
    • https://dulowufokupi.weebly.com/uploads/1/3/4/4/134495444/3422503.pdfIn PDF document text
    • https://vesepuzimimewij.weebly.com/uploads/1/3/0/7/130776402/jurigux_wibiko_komakito.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
    • http://moniladipawi.epizy.com/86701980908.pdfIn PDF document text
    • http://janalusexisowa.epizy.com/detovimotujevo.pdfIn PDF document text
    • http://zuwemanikipe.rf.gd/vpn_browsing_android.pdfIn PDF document text
    • https://s3.amazonaws.com/jezobasit/equifax_free_credit_report_online_canada.pdfIn PDF document text
    • http://goxafufi.rf.gd/720358670.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_off0000efd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD8 5432 bytes
SHA-256: d218b6748fa54b9d9127a99e4992dad67c0ab639a0bf2374fa3c75f7e3294325
font_01_sfnt_off00010255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10255 10064 bytes
SHA-256: 6bf38ac96fbef23ab38aac7b52dcda32966f6edb7aacb2f1088e3e177a86d715
font_02_sfnt_off000124bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124BF 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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