Malicious PDF — malware analysis report

Static analysis result for SHA-256 29548bcb93101aa0…

MALICIOUS

PDF

68.3 KB Created: 2021-03-21 03:17:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e22570d53a0a1769455bbf7eae6b0a2e SHA-1: 2e42c6ac3249046663fa0db74abc6a0c91a36bcd SHA-256: 29548bcb93101aa05a0de32cfeff587e6940645c9e91916431aa302feb6a7183
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. The file contains numerous external links, forming a link farm, with one prominent URL pointing to zajinet.ru. Although no scripts were explicitly extracted, the PDF structure and the presence of external links suggest an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/aws?utm_term=microsoft+word+dark+mode+background
    • https://romugazasemagop.weebly.com/uploads/1/3/4/8/134897733/xabunowotariwoxa.pdf
    • https://static.s123-cdn-static.com/uploads/4448733/normal_6003fe2eb4fb6.pdf
    • https://cdn.sqhk.co/gemadaruvow/hjfjeii/zafikedatuwebewap.pdf
    • https://nukawidizuzaxep.weebly.com/uploads/1/3/3/9/133997642/7350858.pdf
    • https://munejubulogulep.weebly.com/uploads/1/3/4/2/134266186/d8719b5e0.pdf
    • https://cdn.sqhk.co/fifenije/inrighd/ordinal_data_qualitative_or_quantitative.pdf
    • https://sidugavumudoriz.weebly.com/uploads/1/3/4/9/134902227/e67bf805a92214.pdf
    • https://nudametuwino.weebly.com/uploads/1/3/3/9/133997501/ae7ff25856.pdf
    • https://worijuxadije.weebly.com/uploads/1/3/4/8/134863955/387cf72ae4c937.pdf
    • https://jegobagugixados.weebly.com/uploads/1/3/4/8/134858953/1e4772a9fbfc7d.pdf
    • https://newosupileseru.weebly.com/uploads/1/3/2/3/132303396/4e5afe71e1.pdf
    • https://cdn.sqhk.co/dogojaseziwo/Sjgibx7/tufomodijoxosivo.pdf
    • https://taxefijiduru.weebly.com/uploads/1/3/5/3/135311915/5fab7096cd53524.pdf
    • https://cdn.sqhk.co/motuwezelu/gdmjbig/okay_synonym_informal.pdf
    • https://zujuwedidikaf.weebly.com/uploads/1/3/4/3/134375258/fajogodaw-dixew.pdf
    • https://static.s123-cdn-static.com/uploads/4446917/normal_5fe54d41db9cf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/fc8033b1-9048-4a60-8cf2-0861f1d5912b/how_to_program_a_radio_shack_weather_alert_200_channel_scanner.pdf
    • https://uploads.strikinglycdn.com/files/ed8c6a01-43df-4ba5-abc7-a9ecd7335b06/37848949941.pdf
    • https://uploads.strikinglycdn.com/files/513c7230-ff35-4ad0-9886-21a86a19f171/upcoming_makeup_releases_2020_fall.pdf
    • https://uploads.strikinglycdn.com/files/d819ff30-bde4-417d-ac7f-7ea64f0b94d1/vawafeto.pdf
    • https://uploads.strikinglycdn.com/files/6f650a26-24e8-41dc-9940-46cc34c1767c/kenwood_ddx418bt_manual.pdf
    • https://uploads.strikinglycdn.com/files/fc8cfe8f-f455-405c-b1c5-73b5fc427dc2/apa_6th_lab_report_format.pdf
    • https://uploads.strikinglycdn.com/files/54a78ee0-7156-46ea-89b1-e44c47eb6af0/23760369251.pdf
    • https://uploads.strikinglycdn.com/files/153a113e-4586-409d-8ba5-763ffdf40219/8820616752.pdf
    • https://uploads.strikinglycdn.com/files/5756815f-309f-49b9-85d5-e971bcf93afe/79183350775.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf65.bin
204242f988f4abe6272c1e3afb911bec096d47779751904bc8f36a9d75d411a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF65 5608 bytes
font_01_sfnt_off0000e28b.bin
10c5c1e0bd5746be4129ef93d9bebd0d9418449b22d8ec16e1291d09d4aee800		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE28B 9748 bytes

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