Malicious PDF — malware analysis report

Static analysis result for SHA-256 29a38cb272254446…

MALICIOUS

PDF

79.9 KB Created: 2021-05-29 12:49:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c60b2ce8ab9989b504dcf0b19bed51a3 SHA-1: 969cc4a40702577246fcc08bfc7fdd3258106d97 SHA-256: 29a38cb27225444603af565877c279c3dec42f74d45e14d347865adf79e4f318
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or redirection mechanism. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains text related to academic exams, which is a common lure for such attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/strik?utm_term=examen+de+sexto+grado+de+primaria+primer+bimestre+con+respuestas
    • https://topitodowel.weebly.com/uploads/1/3/4/8/134890479/depubogekexi.pdf
    • https://laregokirula.weebly.com/uploads/1/3/0/9/130969776/cbe627326.pdf
    • https://bexitapanirid.weebly.com/uploads/1/3/0/9/130969950/gerekeku_padusetuxelo_vajorefusefe_benurav.pdf
    • https://kexiwiwimibip.weebly.com/uploads/1/3/1/3/131379584/0814a532.pdf
    • https://cdn-cms.f-static.net/uploads/4405902/normal_604b88af068b0.pdf
    • https://nesefutuderixu.weebly.com/uploads/1/3/2/7/132740375/duvegapajudovog.pdf
    • https://gomarevijupa.weebly.com/uploads/1/3/4/5/134585171/vizovokimix.pdf
    • https://porexogu.weebly.com/uploads/1/3/0/7/130775034/ferufus.pdf
    • https://jivafizet.weebly.com/uploads/1/3/4/7/134743279/e5af0e7e2.pdf
    • https://xivapumi.weebly.com/uploads/1/3/1/6/131606059/70c27.pdf
    • https://wenigekotowas.weebly.com/uploads/1/3/4/5/134576851/4946170.pdf
    • https://zenisitidijo.weebly.com/uploads/1/3/4/3/134309999/b0c4d.pdf
    • https://static.s123-cdn-static.com/uploads/4455198/normal_5fe33c41df03f.pdf
    • https://begosibaluta.weebly.com/uploads/1/3/0/7/130775163/xivuza.pdf
    • https://fuzalufukaxod.weebly.com/uploads/1/3/4/7/134714992/7128430.pdf
    • https://vofitikasu.weebly.com/uploads/1/3/1/8/131871658/nenazigejaxunetuvu.pdf
    • https://pimupaxepa.weebly.com/uploads/1/3/1/8/131857198/9815a48dd9897.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/292ee59d-8fef-4725-b10d-8940510a17ce/19147181709.pdf
    • https://uploads.strikinglycdn.com/files/d71ab5e0-a49a-4256-9ec8-0007cf62dafc/how_to_get_ham_radio_license_canada.pdf
    • https://uploads.strikinglycdn.com/files/c5237f30-bcfd-4a1d-ab47-6fd158ce1601/carel_temperature_controller_manual.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e669.bin
009776f49bd3a608e8a0dfc1ee9b65b42483c5f4993431e7025f5efd2920ed68
pdf-font-stream PDF embedded font (sfnt) at offset 0xE669 5408 bytes
font_01_sfnt_off0000f8b5.bin
08e27619e975658d4632c6f89d9c0014dd42970b1a13fc2cc76b30a7f10ae9a5
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B5 12780 bytes
font_02_sfnt_off00012178.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x12178 4324 bytes