Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc25aa3386ae0d9a…

MALICIOUS

PDF

60.5 KB Created: 2021-01-24 01:06:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 71dbc2b0b2e43e5bd63795256420fe1d SHA-1: 01db67c509cf1c96673124700e9415bebca91345 SHA-256: dc25aa3386ae0d9acfcc8593cb3d51d8515be064be6b075ae3cefa4cf1fb4a9b
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded links pointing to suspicious domains, including a known malicious redirector. The heuristic firings indicate the document is designed to redirect users to potentially harmful content, leveraging link farms on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://traffmen.ru/wb?keyword=grimvalor%20cheats%20android In PDF document text
    • https://moluzepin.weebly.com/uploads/1/3/1/8/131856103/raxol_zezur_fozujetukafomas_wepabi.pdfIn PDF document text
    • https://site-1168054.mozfiles.com/files/1168054/antennapod_gpodder_sync.pdfIn PDF document text
    • https://xelexezeni.weebly.com/uploads/1/3/0/7/130740222/4762093.pdfIn PDF document text
    • https://losiweso.weebly.com/uploads/1/3/1/3/131380476/miliwiripifeviwis.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378831/normal_5fcd0a58c9e27.pdfIn PDF document text
    • https://site-1199448.mozfiles.com/files/1199448/12889389447.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496360/normal_5fc969beb7954.pdfIn PDF document text
    • https://site-1178204.mozfiles.com/files/1178204/free_citra_3ds_emulator_for_android.pdfIn PDF document text
    • https://site-1177484.mozfiles.com/files/1177484/sukupuf.pdfIn PDF document text
    • https://mikixobitesa.weebly.com/uploads/1/3/0/7/130776626/7f98a78d04e885a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402956/normal_6009a5b4823cd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pigosoj.epizy.com/chemistry_laboratory_glassware_word_search_answers.pdfIn PDF document text
    • http://tawenaxogiminax.epizy.com/jigux.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_off0000b384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB384 5268 bytes
SHA-256: 2db957b91c7e99c66e26d7d9f20b9489d8ffcfcbbec7421204f4b10efe092940
font_01_sfnt_off0000c542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC542 9476 bytes
SHA-256: 6dc279bf599f181c14e176b8f5de275011e5882daf4d9b58dec76c694be6b553

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