Malicious PDF — malware analysis report

Static analysis result for SHA-256 5485d0e7ed8a5055…

MALICIOUS

PDF

82.6 KB Created: 2021-04-11 17:08:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 94429927c5ebe1b6e326ea299a0bda92 SHA-1: bac4a5107533cd9cb6840c93405410dc12746787 SHA-256: 5485d0e7ed8a50557174639d381feca74cf1903054c0a51b514d45a2ebab4ac3
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains embedded URLs pointing to suspicious domains, including one that appears to be a link farm designed for SEO manipulation. The document body, though heavily obfuscated, suggests a lure related to a book summary, which is a common tactic for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 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://vilenefex.ru/strik?utm_term=narrative+of+the+life+of+frederick+douglass+chapter+1-4+summary PDF link annotation
    • http://ginalupajeriw.scienceontheweb.net/55852474620.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405895/normal_6042ddf727972.pdfIn PDF document text
    • https://pinababinazu.weebly.com/uploads/1/3/2/6/132695354/7729325.pdfIn PDF document text
    • http://pimifawimonidij.mywebcommunity.org/48452200542.pdfIn PDF document text
    • https://tofikopu.weebly.com/uploads/1/3/1/3/131381225/6890072.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490132/normal_6012a991a3181.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443815/normal_5ffa04fb9e498.pdfIn PDF document text
    • https://gutusalewizewuj.weebly.com/uploads/1/3/1/8/131871657/wigufolijerogowe.pdfIn PDF document text
    • https://katebobuwusa.weebly.com/uploads/1/3/1/3/131384636/3672c5bda21.pdfIn PDF document text
    • http://puvepum.getenjoyment.net/budelesixizixaxejiso.pdfIn PDF document text
    • http://microbestdigitalmeter.xyz/7252258373699waj.pdfIn PDF document text
    • http://biwedujurar.mywebcommunity.org/gozepogi.pdfIn PDF document text
    • http://legegapepapo.medianewsonline.com/51737564189.pdfIn PDF document text
    • http://ueuniti.website/bwapp_full_tutorialvttsj.pdfIn PDF document text
    • https://sumejuloluguwir.weebly.com/uploads/1/3/5/3/135390827/46844.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
    • https://s3.amazonaws.com/biwuwukesazef/wurabagi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00fbb7ef-f95c-49c8-85c0-6e73e893e706/kogolijubepevofevideromew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d6524e2-0b52-4b1f-aafc-ec9a1774d9ac/par_quoi_remplacer_le_beurre_de_cacao.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9334f7ae-ebc0-4010-8ce1-38550eac7737/an_indigenous_peoples_history_of_the_us_chapter_3_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/vutame/descriptive_writing_for_grade_3_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/fekaduvopigab/vedenafelikajes.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxawetawupo/99954366500.pdfIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/39007271510.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e17886b-595a-469e-b3a9-14d2fb027c67/remakosafekonaxif.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_off0000f6f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F5 5712 bytes
SHA-256: 969fc13e5c09cdb28c30d58d240b6a0e6b232c5ec16d9a8ef6f27262d8e93041
font_01_sfnt_off00010a99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A99 10160 bytes
SHA-256: 7ac6674fcce2199742c1a1e20d605fd3edd28ecce7f0a430fd2b7a1a5c704028
font_02_sfnt_off00012d80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D80 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230