Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2834016ad6cd93b…

MALICIOUS

PDF

77.2 KB Created: 2021-04-04 08:15:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 9a0d8ab6c7c8a734ab26688a9c822210 SHA-1: 414631d18153982a231a19bfb378bbf5f99ce202 SHA-256: d2834016ad6cd93bfde28db525fa13cbfc7e4a4f5486cd7a0d806816248d43a1
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many of which point to suspicious domains, suggesting a link farm or redirection scheme. The document body, though heavily obfuscated, appears to reference certification guides, a common lure for phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • 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://lozipotod.ru/award?keyword=ccna+routing+and+switching+200+125+certification+guide+pdf PDF link annotation
    • http://idealslim-italiaoficial.site/vagemoguremobatetx8egr.pdfIn PDF document text
    • http://devlp.design/7811394708opk1b.pdfIn PDF document text
    • http://questotzvezd.space/99548514104c6lyh.pdfIn PDF document text
    • http://iblack.space/pexitowavelizemugowajokivjrlr7.pdfIn PDF document text
    • http://expressday.online/insinkerator_badger_5xp_3_4_hp_review8cxnw.pdfIn PDF document text
    • http://milesnires.xyz/ravejovebozazidaxuxuv2014.pdfIn PDF document text
    • https://mewemevo.weebly.com/uploads/1/3/1/4/131454270/sanilovanid.pdfIn PDF document text
    • http://meetsucre.pro/sikadukazajezugewopalinigtigs.pdfIn PDF document text
    • https://wixotavu.weebly.com/uploads/1/3/4/7/134764887/4f87ae5d28e0.pdfIn PDF document text
    • https://muverepifakapi.weebly.com/uploads/1/3/5/3/135387058/vozavevunoteki.pdfIn PDF document text
    • http://nibelv.xyz/vipibumos42m7f.pdfIn PDF document text
    • http://inter-kalinka.ru/previous_employment_verification_letter_template_wordrteml.pdfIn PDF document text
    • https://lumigoxodavi.weebly.com/uploads/1/3/1/6/131606620/41744b.pdfIn PDF document text
    • https://lojexidipiwakif.weebly.com/uploads/1/3/4/0/134041559/rorunizen.pdfIn PDF document text
    • http://onlinetyz.xyz/oral-b_white_pro_1000_power_rechargeable_electric_toothbrush_walmartv5avg.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/xoferuzu/60718704453.pdfIn PDF document text
    • https://s3.amazonaws.com/gedexim/jeruzajobipowekimikaxum.pdfIn PDF document text
    • https://s3.amazonaws.com/liguwubore/benadryl_fa_davis_drug_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/scribus_tutorial_page_layout.pdfIn PDF document text
    • https://s3.amazonaws.com/kiremefegonar/26082054981.pdfIn PDF document text
    • https://s3.amazonaws.com/ziwuvijevo/smok_nord_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxefemebidaz/lofejoma.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_off0000ed7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7A 5832 bytes
SHA-256: 9a2a465cdc63d2843173cc1206951f7ff61f652fd0bf4f174f20a501c8f2cdaf
font_01_sfnt_off00010167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10167 10968 bytes
SHA-256: 017ace9bfe0f740c6d5fc5194bcb459c3104154acc3e3eae83b77567450c871e

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