Malicious PDF — malware analysis report

Static analysis result for SHA-256 73a6b07c6917170b…

MALICIOUS

PDF

70.3 KB Created: 2021-01-13 04:05:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 15edceca93dde306502cbd5d8eab9d07 SHA-1: d71dc9f574f24deffd9a22729841989b8536d825 SHA-256: 73a6b07c6917170b872ff1cfc1897a0af094b5e044e4ecc790dd8c2e10ff7a1f
224 Risk Score

Malware Insights

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

This PDF file contains multiple embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also flagged this sample with high confidence. The document body, though heavily obfuscated, suggests a lure related to searching for devices, potentially to harvest credentials or trick users into downloading further malware. The presence of MFA lure heuristics further supports a credential harvesting or session hijacking intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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.
  • 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://cctraff.ru/aws?utm_term=buscar+iphone+em+android In PDF document text
    • https://cdn.sqhk.co/wadusazilox/zjb6VCs/18828311294.pdfIn PDF document text
    • https://cdn.sqhk.co/wifurovud/ibpN5hc/gejaxujuzumujinedusen.pdfIn PDF document text
    • https://site-1166603.mozfiles.com/files/1166603/31733808781.pdfIn PDF document text
    • https://cdn.sqhk.co/lodikorep/2GI6pN7/12610087284.pdfIn PDF document text
    • https://cdn.sqhk.co/tubafejog/icRgfdl/rta_audio_analyzer_apk.pdfIn PDF document text
    • https://tumokisomagen.weebly.com/uploads/1/3/4/8/134897409/4727738.pdfIn PDF document text
    • https://gidaletibom.weebly.com/uploads/1/3/4/8/134881461/ae478cab5e8817f.pdfIn PDF document text
    • https://feronokemafa.weebly.com/uploads/1/3/1/1/131164109/4559431.pdfIn PDF document text
    • https://rosuxemu.weebly.com/uploads/1/3/0/7/130776582/bijati_dutiravozuda_badituf.pdfIn PDF document text
    • https://zofenegug.weebly.com/uploads/1/3/1/6/131636866/bawuripidad_vexovel.pdfIn PDF document text
    • https://fabevapomuwi.weebly.com/uploads/1/3/4/6/134607330/jobigovugujo_gojerid_sovedikipa.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/miwolezedubujoz/xanoruvenas.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_off0000c973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC973 5132 bytes
SHA-256: c12c6fc4e8d9365b50204ac70c0576b6a54a95f5ab528f92ef97e03d29896a18
font_01_sfnt_off0000daa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA7 10324 bytes
SHA-256: 409898d731c043520e6a90fcccd9727189b9280d1ffc4d09a867aa7be15fd2d6
font_02_sfnt_off0000fe16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE16 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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