Malicious PDF — malware analysis report

Static analysis result for SHA-256 d244c69adc161ab1…

MALICIOUS

PDF

75.5 KB Created: 2021-03-16 16:47:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 2a6faff0ac46fe4209b5d8543b25eb60 SHA-1: c46bd4495598d18da1a8061ecc5f30b8265ccdff SHA-256: d244c69adc161ab17eebf8d460951c8c01c7301b9809255234c9cef0c9bbd786
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm strategy, suggesting the document's primary purpose is to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the presence of numerous external URIs and the overall detection as a phishing/trojan PDF strongly indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://zajinet.ru/123?utm_term=lasagna+recipe+using+dried+pasta+sheets PDF link annotation
    • http://kusukeluwabe.mywebcommunity.org/peptic_ulcer_disease_2020.pdfIn PDF document text
    • http://com-servers.online/the_production_of_space_review14mas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497348/normal_5fffc06708ea5.pdfIn PDF document text
    • https://jupimoxojufe.weebly.com/uploads/1/3/4/8/134860775/9317713.pdfIn PDF document text
    • http://ogranicbio.space/spell_bee_words_grade_7eaqo2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466370/normal_6027cbefed3fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446016/normal_602c139ee492d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456387/normal_5ffa6e9edc24e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473064/normal_601b12c494a60.pdfIn PDF document text
    • http://tapavinologo.mygamesonline.org/71135180496.pdfIn PDF document text
    • http://mpvideo.org/75105650135sjwck.pdfIn PDF document text
    • http://jaralet.getenjoyment.net/60925941226.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463554/normal_6013a6159d474.pdfIn PDF document text
    • http://menformula.xyz/insinkerator_badger_500_1_2_hp_continuous_feed_garbage_disposal_with_power_cordi6679.pdfIn PDF document text
    • https://romevezijije.weebly.com/uploads/1/3/4/7/134756673/8508927.pdfIn PDF document text
    • https://foxujutuz.weebly.com/uploads/1/3/4/3/134348357/pozawoj-mowakesopulij-favuribap.pdfIn PDF document text
    • https://voloripilobolim.weebly.com/uploads/1/3/4/6/134635915/zodevudelesoti.pdfIn PDF document text
    • https://danexuxubusam.weebly.com/uploads/1/3/2/6/132695747/kivenozi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412607/normal_600a8f47a100d.pdfIn PDF document text
    • http://luminar4-download.xyz/jain_and_mathur_world_history_book_free_downloadictov.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gunagiweraji.rf.gd/wysiwyg_editor_html5_template.pdfIn PDF document text
    • http://mexesumofiruvaf.rf.gd/free_avg_tuneup_2015_full_version.pdfIn PDF document text
    • http://fubavinexazixo.onlinewebshop.net/behaviour_modification_10th_edition.pdfIn PDF document text
    • http://zibusawaf.epizy.com/how_to_do_calligraphy_with_markers.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_off0000e9d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D9 5244 bytes
SHA-256: 62ab8cfaab5ffc08453434dd120fc31c579775324dbe3a3a646d1f9205a30ed9
font_01_sfnt_off0000fbad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAD 10820 bytes
SHA-256: 3f7f8b78034a44e08da503fd4a811f201ab95a39ce0d73e71c3ac1205fcfa7d2

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