Malicious PDF — malware analysis report

Static analysis result for SHA-256 0163f8a7c890abb1…

MALICIOUS

PDF

86.4 KB Created: 2021-05-31 19:22:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 76286ae121a528e1a7f4a0cb4f3bc3cc SHA-1: 76eb6b576b71d48cf50f2acbe589b6c11405c98b SHA-256: 0163f8a7c890abb19781459b422b06f2b752c75d01e333e9aa99f362adc0e0e3
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files hosted on services like Weebly, suggesting a link farm or SEO manipulation tactic. ClamAV and ML classifiers indicate malicious content, specifically identified as phishing or a trojan. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a malicious campaign, likely involving spearphishing attachments to distribute these links.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wastran.ru/pbw?utm_term=original+crazy+frog+ringtone+download
    • https://gafepidata.weebly.com/uploads/1/3/0/7/130776025/9545316.pdf
    • https://diforugagok.weebly.com/uploads/1/3/2/7/132741100/ginek.pdf
    • https://tikodukika.weebly.com/uploads/1/3/0/7/130776738/nufamuvusalipafufad.pdf
    • https://rozutawupev.weebly.com/uploads/1/3/2/6/132695629/8537921.pdf
    • https://luresigixake.weebly.com/uploads/1/3/5/2/135294948/6ec842.pdf
    • https://furuvisagibeveb.weebly.com/uploads/1/3/1/4/131453033/vovebabosemukes-wokema-logewoka.pdf
    • https://zizobisorodevu.weebly.com/uploads/1/3/5/9/135964877/nowil-nevoferabusefev-muzanarol.pdf
    • https://fafevidelaxikez.weebly.com/uploads/1/3/4/4/134481631/bimesuzunexu-lezofa-rajarubuz-maxagukekozifax.pdf
    • https://jozurukezareta.weebly.com/uploads/1/3/4/7/134741488/d1d16fe9.pdf
    • https://kigokowolabewal.weebly.com/uploads/1/3/4/1/134132594/8c4176c217278.pdf
    • https://lafuxekezijunu.weebly.com/uploads/1/3/1/4/131406487/804094.pdf
    • https://depuxibuf.weebly.com/uploads/1/3/4/7/134762413/xedomafozan.pdf
    • https://rufamuvobaj.weebly.com/uploads/1/3/4/7/134720601/7965485.pdf
    • https://jevuzukolusiwu.weebly.com/uploads/1/3/0/7/130739503/2005941.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tazijebep.pbworks.com/w/file/fetch/144419520/adobe_reader_professional_free_download_for_windows_xp.pdf
    • http://sepaxebi.pbworks.com/f/what_is_hills_prescription_diet_a_d.pdf
    • http://zezimin.pbworks.com/w/file/fetch/144412056/vobobevedotikire.pdf
    • http://natizasex.pbworks.com/w/file/fetch/144411603/esquadrao_suicida_acerto_de_contas_online_dublado.pdf
    • http://xedidovetaw.pbworks.com/f/what_is_isentropic_work.pdf
    • http://kedetuwi.pbworks.com/f/sebinewejasodimo.pdf
    • http://mumubib.pbworks.com/w/file/fetch/144413343/38456949116.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_off00011325.bin
1e304c4217dfbc2758d6021734bb1dbc11077a64dadb11d8502dbc95e40e483e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11325 5284 bytes
font_01_sfnt_off0001254b.bin
a14d5b8d580095a6bc88efd7978be5f6cc16e664f268773a261be699627c721a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1254B 11220 bytes

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