Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d671c17457f094b…

MALICIOUS

PDF

73.6 KB Created: 2021-02-13 08:52:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6ac00a529306ff74af0c995229c08c2d SHA-1: 1a0f15917aaf0fea115a7323e60c2bcf98148115 SHA-256: 3d671c17457f094bc0b9a910df46ef4d120cf643166fc65386761adbba0464a7
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable domains and redirector infrastructure, indicating a phishing or malware distribution attempt. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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.
  • 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/aws?utm_term=couch+to+5k+training+pdf
    • https://cdn.sqhk.co/wenewojufaj/v1hbigC/thrifty_car_rental_orlando.pdf
    • https://zuwexonoporij.weebly.com/uploads/1/3/5/3/135317719/texakadejid.pdf
    • https://cdn.sqhk.co/tesadubozino/qhbOjgV/60224468398.pdf
    • https://cdn.sqhk.co/nejibija/BhjiBpn/kokugi.pdf
    • https://zaxadumumuguxe.weebly.com/uploads/1/3/1/4/131454216/6073450.pdf
    • https://cdn.sqhk.co/luwivimexu/ij8jjia/mcat_scores_by_race_and_gender.pdf
    • https://cdn.sqhk.co/vekosozob/Fjfdrhh/59008269396.pdf
    • https://cdn.sqhk.co/ributexovek/iahdOsK/my_private_wifi_hotspot_download.pdf
    • https://vojidejera.weebly.com/uploads/1/3/2/6/132695434/6596dec67ccc69.pdf
    • https://gitosupogule.weebly.com/uploads/1/3/2/7/132741155/junadefojegezot_rarufajizumopis.pdf
    • https://xakivemo.weebly.com/uploads/1/3/0/7/130739368/tirobilexilusifew.pdf
    • https://mopomavimixefor.weebly.com/uploads/1/3/1/1/131164117/9741489.pdf
    • https://marodesama.weebly.com/uploads/1/3/5/3/135349202/gelerumonosuvefolo.pdf
    • https://jasasexu.weebly.com/uploads/1/3/1/1/131163864/9605185.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xufujofaleki/wrong_turn_3_movie_in_tamil.pdf
    • https://s3.amazonaws.com/tobito/kamaiyan_aslam_ali_video_song_mp4.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e34b.bin
6d9337b912bf5550a74be8726045252662e5841528a8a9ab21968822b22876a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE34B 5300 bytes
font_01_sfnt_off0000f554.bin
28f8f0025476cac368ac89a3c3dd02770136a205adb3d7fe6e7e857f1131559e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF554 10696 bytes

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