Malicious PDF — malware analysis report

Static analysis result for SHA-256 1815a844f4ab5abf…

MALICIOUS

PDF

118.6 KB Created: 2021-01-12 04:40:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 22675efafa7ad8148dc12be1988d29b5 SHA-1: 24f1cf5f17dba45d9774e3579d4e2f9389878b15 SHA-256: 1815a844f4ab5abfd843192fbee7939a3b8351a2b38c309d849846fd10e2d13b
184 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical alert for linking to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains references to URLs that are likely part of a phishing or malware distribution scheme. The presence of multiple embedded URLs and the ML classifier's high confidence score indicate a strong likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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/123?utm_term=regla+9+de+voleibol In PDF document text
    • https://bawenijujobafo.weebly.com/uploads/1/3/4/6/134670929/rebudasuximi-vevagi.pdfIn PDF document text
    • https://valutakawewa.weebly.com/uploads/1/3/1/3/131378791/6532020.pdfIn PDF document text
    • https://figinuvoniz.weebly.com/uploads/1/3/4/6/134654755/5717055.pdfIn PDF document text
    • https://site-1168324.mozfiles.com/files/1168324/13695364908.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388157/normal_5f93c063a1e2a.pdfIn PDF document text
    • https://xejapekedom.weebly.com/uploads/1/3/4/8/134864907/tegek.pdfIn PDF document text
    • https://site-1178372.mozfiles.com/files/1178372/zombie_killing_map_fortnite_code.pdfIn PDF document text
    • https://site-1171615.mozfiles.com/files/1171615/fitness_bodybuilding_app_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368486/normal_5fade650909a3.pdfIn PDF document text
    • https://site-1199467.mozfiles.com/files/1199467/flix_movie_theater.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rivazixexuguri/15503296739.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001957b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1957B 5080 bytes
SHA-256: 05cf82c6ba9a379af027a05ef32cb4cd9193b19890a60a6e668c1bc0baaf8805
font_01_sfnt_off0001a6e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A6E2 11552 bytes
SHA-256: c2508425c69b4f2b00ddeed2e4d9a614b6e922bc4b652c5171fa0a12d98ef453

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