Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7dc2ef94e9e1f62…

MALICIOUS

PDF

69.5 KB Created: 2021-02-21 01:27:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 8dde7b57a2d06629b36e37ce81001ffa SHA-1: 269f3a027ba086a73f1265e8ec308fb517ab0083 SHA-256: d7dc2ef94e9e1f620db4e415e6b1c48328e836c46dec5ad1b915b4a26d91299d
184 Risk Score
Tags
free-cdn-ebook-manual-lure

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 embedded URLs and the document's structure suggest it is part of a phishing or malware distribution scheme, likely attempting to trick users into downloading further malicious content. No scripts were extracted from this sample, but the presence of malicious links is a strong indicator of its intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://yafferge.ru/123?utm_term=barron%2527s+ap+statistics+pdf+download In PDF document text
    • https://cdn.sqhk.co/dilobowuz/igxbjfv/tetizukexebatobezodeseju.pdfIn PDF document text
    • http://erogancolumbia.site/80489035944dugdv.pdfIn PDF document text
    • https://cdn.sqhk.co/sunidoxil/LylU3ii/pallabi_smart_application.pdfIn PDF document text
    • http://xisulekotitis.iblogger.org/95644241768.pdfIn PDF document text
    • https://cdn.sqhk.co/pinebiven/jTKwfgg/jokizagasosa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428035/normal_5fd13b033e7a4.pdfIn PDF document text
    • http://jidagepopisar.22web.org/la_hija_del_sastre_ch_13_vocab.pdfIn PDF document text
    • http://vkrowl.com/45117222398uciiv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zanebinelit.rf.gd/character_and_antecedent_certificate_for_ssb.pdfIn PDF document text
    • http://tunawibiga.rf.gd/78635344461.pdfIn PDF document text
    • http://sisuvoxodukon.epizy.com/windows_server_2012_r2_standard_vs_datacenter_hyper-v.pdfIn PDF document text
    • http://vilujemes.rf.gd/uon_admission_letter_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/votubukaxogilix/41467931163.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_off0000d185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD185 5324 bytes
SHA-256: 01235d54a8bf742c9d7c9bcf3266d916bf43af3d0903fa61a464f3572fdae121
font_01_sfnt_off0000e3c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C9 11688 bytes
SHA-256: 6732ca01e2fb79bb4b4d32eb8f8435f6932dcc4548398e57994927bb7809d707

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