Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a60272f9c76e574…

MALICIOUS

PDF

74.9 KB Created: 2021-02-16 20:53:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 90bd08e81ab61b448d09057a4cf489c6 SHA-1: d5d4bd8ad49ef96f0e7a0861da5441f8a1db2875 SHA-256: 1a60272f9c76e5740573b4d9033f2f71b4ff2876ff6f02959d71bad68c979698
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable domains or redirect to malicious infrastructure. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' indicate that the document is designed to redirect users to potentially harmful websites, likely for phishing or malware distribution. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://crophysi.ru/strik?utm_term=how+much+is+interior+designer+fees In PDF document text
    • https://cdn.sqhk.co/nedupugifuka/jeib4dC/27854885198.pdfIn PDF document text
    • https://cdn.sqhk.co/retagigimusa/YUnlFia/pawomisiladokibovitup.pdfIn PDF document text
    • https://cdn.sqhk.co/feletitami/oiaAjgR/sinister_night_horror_survival_adventure_games_ps4.pdfIn PDF document text
    • https://cdn.sqhk.co/vekuperik/ggTCaic/badubuzumuzixunurumakok.pdfIn PDF document text
    • https://poxagubojawi.weebly.com/uploads/1/3/1/4/131482812/4760750.pdfIn PDF document text
    • https://voxudipuxun.weebly.com/uploads/1/3/5/3/135319737/fatasafopexul_belujolinawidon_waribid_kadizetowajas.pdfIn PDF document text
    • https://zezojafoxivofed.weebly.com/uploads/1/3/4/5/134528913/takivosu.pdfIn PDF document text
    • http://jibuveborufo.iblogger.org/jalaj.pdfIn PDF document text
    • https://falaxejuwutop.weebly.com/uploads/1/3/2/6/132681153/moziwubelosotokol.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/wuvepilamamuse/la_bayadere_sheet_music.pdfIn PDF document text
    • http://doledakejopoted.rf.gd/92110179550.pdfIn PDF document text
    • http://xepolowamozuxan.rf.gd/48703635863.pdfIn PDF document text
    • http://babupit.epizy.com/angry_birds_movie_tamil_tamilrockers.pdfIn PDF document text
    • https://s3.amazonaws.com/jujadodedaruxix/maven_junit_generate_xml_report.pdfIn PDF document text
    • http://wisalawisavu.epizy.com/zidemazekakegomuxodaliji.pdfIn PDF document text
    • https://s3.amazonaws.com/laradusa/analogical_reasoning_in_islamic_jurisprudence.pdfIn PDF document text
    • http://tamufigavoxi.rf.gd/4953198180.pdfIn PDF document text
    • https://s3.amazonaws.com/popisiburewixuj/88631551781.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_off0000e740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE740 5244 bytes
SHA-256: faf39526a04276d5317a7a118a49053ff5a74bca817b95b814fc6f3799ccbb7a
font_01_sfnt_off0000f901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF901 11048 bytes
SHA-256: 6a6721758adf534f65927ff273c0734ab785d5ab5a6ebc2b15671152d6624075

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