Malicious PDF — malware analysis report

Static analysis result for SHA-256 628c4349427cdeb3…

MALICIOUS

PDF

64.9 KB Created: 2021-01-23 20:46:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: f8dcc5f34c3afd8abc7f8c8895644885 SHA-1: ed07a09f99bc51e9a3c41876f30cedbeb19dbc2e SHA-256: 628c4349427cdeb3aaa1d490e206353a3b7ec236a5e467f14f9004696c0a96c8
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/123?utm_term=neutrogena+body+oil+walgreens PDF link annotation
    • https://site-1252602.mozfiles.com/files/1252602/canon_eos_7d_mark_ii_brochure.pdfIn PDF document text
    • https://site-1168208.mozfiles.com/files/1168208/30038478657.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380395/normal_5fd12b2a92686.pdfIn PDF document text
    • https://site-1166701.mozfiles.com/files/1166701/37275667933.pdfIn PDF document text
    • https://site-1193591.mozfiles.com/files/1193591/alien_shooter_latest_version_mod_apk.pdfIn PDF document text
    • https://site-1194964.mozfiles.com/files/1194964/2861701915.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454977/normal_5ff661fec213b.pdfIn PDF document text
    • https://site-1177265.mozfiles.com/files/1177265/spy_camera_online_watch.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473640/normal_5fedb8f623044.pdfIn PDF document text
    • https://site-1178382.mozfiles.com/files/1178382/autocad_2018_and_install_permanently.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493888/normal_5fe9c2295dc87.pdfIn PDF document text
    • https://site-1212500.mozfiles.com/files/1212500/lebuvidorepizuzefuko.pdfIn PDF document text
    • https://site-1168179.mozfiles.com/files/1168179/lovely_planet_trophy_guide.pdfIn PDF document text
    • https://site-1172089.mozfiles.com/files/1172089/aisi_4340_material_properties.pdfIn PDF document text
    • https://site-1221793.mozfiles.com/files/1221793/71792299000.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368751/normal_5fca594427465.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC077 5296 bytes
SHA-256: 0d4acd3bdab47c209d67d71c6e8d86aa0de65468f46312555e06603fb20a6783
font_01_sfnt_off0000d2a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A1 10680 bytes
SHA-256: 256e579407976a90dce61bda3a8d2c311c332694fadc9d78d8690e6f4badc590

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