Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c3e7d0870c005a4…

MALICIOUS

PDF

75.8 KB Created: 2021-06-14 08:59:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: e7bb7a6124ff88278cfe292152449e53 SHA-1: c9345f371b2a800d3a8ef814eeeffde2aa8e1a0e SHA-256: 1c3e7d0870c005a41ebee6737d314036794d57dadcab2d6fe8def870387fa3cc
186 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm used for phishing or distributing further malware. The presence of a URL with a 'utm_term' parameter further supports a campaign-driven attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://medvor.ru/pbw?utm_term=xbox+one+ark+split+screen PDF link annotation
    • https://sekawoxovezu.weebly.com/uploads/1/3/4/0/134018239/2043939.pdfIn PDF document text
    • https://folitovuf.weebly.com/uploads/1/3/1/4/131406115/vutobosajogapa.pdfIn PDF document text
    • https://pojosividadom.weebly.com/uploads/1/3/4/5/134524524/ab477d0d607.pdfIn PDF document text
    • https://wirolarem.weebly.com/uploads/1/3/1/6/131636642/purimupi.pdfIn PDF document text
    • https://topifovav.weebly.com/uploads/1/3/4/5/134595147/718b2fffd.pdfIn PDF document text
    • https://venevivoxeda.weebly.com/uploads/1/3/1/8/131857756/dbc57bc1c.pdfIn PDF document text
    • https://kukixagunobi.weebly.com/uploads/1/3/5/3/135325453/bikam.pdfIn PDF document text
    • https://kozitasulama.weebly.com/uploads/1/3/4/6/134647404/3ee4023c.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://uploads.strikinglycdn.com/files/1e00545a-9f8b-4e89-a91c-a5fbcc5b0696/dr_wayne_dyer_i_am_wishes_fulfilled_meditation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9201086-4e08-4a46-b12e-c922c77338b6/jepajodevojol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf4408b6-8416-4e5c-b493-f438856af02f/how_to_run_python_programs_in_vscode.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3aba7a00-8654-472a-88bb-20d0373d2a91/ti_nspire_cx_cas_gameboy_color_emulator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4e0ce3c-91f6-4833-86d3-300ebd272461/planificacin_estrategica_de_recursos_humanos_de_una_empresa_ejemplos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5a18cc7-a9a6-4ced-8837-8d564270e76b/62173195522.pdfIn PDF document text
    • http://noxiwako.pbworks.com/f/los_7_habitos_de_los_adolescentes_altamente_efectivos_resumen_habito_3.pdfIn PDF document text
    • http://molitutolu.pbworks.com/w/file/fetch/144558861/tiles_hop_mod_apk_ios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee488330-bea5-485a-ba8d-cbd844ddcf5a/33867994507.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c99d0e6-c718-4a99-a5b4-5863a8ebd248/48884002723.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f80254fa-6487-4bdd-ac8e-6d9b0294fbb3/first_things_first_grammar.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_off0000df67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF67 4964 bytes
SHA-256: 1647cf8d29343d0e2a53c19ab5783a7ffc5c9db837efadd49840e8790ca55078
font_01_sfnt_off0000f040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF040 10512 bytes
SHA-256: 2962adfb51240d52eb076672c3f6c4595bb02eeafea4834acd839c247621256b
font_02_sfnt_off00011438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11438 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f