Malicious PDF — malware analysis report

Static analysis result for SHA-256 1690aa819d055797…

MALICIOUS

PDF

75.6 KB Created: 2021-02-15 21:05:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: d13af860fd36e766d689aadb4a1b513f SHA-1: 54f70436991db2fa69ea762ad9a1c5243ee54a27 SHA-256: 1690aa819d05579756447c005c746099c3ed9e1cfc856526f351e240b5eed1c1
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with critical heuristics indicating it functions as a malicious redirector and a link farm hosted on disposable infrastructure. The ML classifier and ClamAV detection strongly support its malicious nature. The primary function appears to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wb?keyword=fun%20choir%20warm%20ups%20for%20adults In PDF document text
    • http://whysmall.space/botnica_geral_wilhelm_nultschb3ryq.pdfIn PDF document text
    • http://natur-green.fun/debepalivaluwagevofu2g7g5.pdfIn PDF document text
    • https://cdn.sqhk.co/lajoroteb/o51tig9/descargar_extreme_moto_winter.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498992/normal_600b6410ca8f5.pdfIn PDF document text
    • https://cdn.sqhk.co/zupodejadofe/NhbsWig/kifuzedati.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373301/normal_5fe295dd0e43d.pdfIn PDF document text
    • https://lexolegav.weebly.com/uploads/1/3/5/3/135350326/dinazomejo.pdfIn PDF document text
    • http://sibuvre.com/bhajan_aarti_ringtonefmxyz.pdfIn PDF document text
    • http://slimerecipe.org/lirododus0lyu4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469641/normal_600aae701b9d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453336/normal_5fe95db345637.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://diturasenupope.epizy.com/postural_hypotension_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/gozilum/fazujeviriwadovuxig.pdfIn PDF document text
    • https://s3.amazonaws.com/donake/android_advertising_id_policy_violation.pdfIn PDF document text
    • https://s3.amazonaws.com/mejifavo/diabetic_ketoacidosis_management_guidelines.pdfIn PDF document text
    • http://kadinox.epizy.com/temekojodenasotidokewini.pdfIn PDF document text
    • http://kakupalufazire.rf.gd/vimivezolepaxa.pdfIn PDF document text
    • http://sawezigulafufa.epizy.com/uc_browser_android_2._3._6.pdfIn PDF document text
    • https://s3.amazonaws.com/suzixegazunow/beige_book_2019.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_off0000eaae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAE 5440 bytes
SHA-256: 16279ce130af969b8f4b14045c06625fc0827681fae5912fc17953366c437618
font_01_sfnt_off0000fd18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD18 10580 bytes
SHA-256: 95c891ce745f5a20c7f08207ed456ae0f0e487b4d8a3daaaf029f5675aff3823

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