Malicious PDF — malware analysis report

Static analysis result for SHA-256 57b5484d63a1c0d2…

MALICIOUS

PDF

72.3 KB Created: 2021-05-08 20:33:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 2d6e9ed7044c1bb1681f79c630a638e6 SHA-1: 39c05ca113d6b171e537203fada39afadf2847a7 SHA-256: 57b5484d63a1c0d25945a168164cf682c467733484dc6e5d8a00f087a64104f5
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable or potentially malicious domains, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a lure to external malicious content, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://dafemum.ru/strik?utm_term=online+printable+crossword+puzzles+easy In PDF document text
    • http://tobufupevujuma.mygamesonline.org/biology_lab_report_format.pdfIn PDF document text
    • http://olivamebel.com/jeet_kune_do_training_near_meqpvww.pdfIn PDF document text
    • https://kujibolivobukib.weebly.com/uploads/1/3/1/1/131163991/wafajizonat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485714/normal_601634eaec03c.pdfIn PDF document text
    • https://xagomutub.weebly.com/uploads/1/3/4/3/134321984/noxujetadopizog.pdfIn PDF document text
    • http://bibuzikufaje.mygamesonline.org/nelan.pdfIn PDF document text
    • http://vorakumezaxof.mygamesonline.org/pogemokegizit.pdfIn PDF document text
    • http://lianhua.life/31182950953znvyx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375358/normal_6028e57867334.pdfIn PDF document text
    • http://yblda.fun/identifying_parts_of_a_circle_worksheethdqag.pdfIn PDF document text
    • http://vumogegotawugub.mypressonline.com/atomic_weight_of_elements_download.pdfIn PDF document text
    • http://fitit.space/canon_lide_400_vs_300ca4p1.pdfIn PDF document text
    • http://kimisorunutom.medianewsonline.com/causes_of_major_depression.pdfIn PDF document text
    • http://runmasten.online/534533684331suiz.pdfIn PDF document text
    • https://zugozoriv.weebly.com/uploads/1/3/4/7/134770463/nakozo-finozozedafoka-woduxikew-sekabife.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379477/normal_6054323fdc9ee.pdfIn PDF document text
    • http://idealicaitalia.website/66696174832b8vnd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410217/normal_5ff12f4eecdcd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414176/normal_5fdd37a9b9151.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nuluwajewugutik.onlinewebshop.net/69144393230.pdfIn PDF document text
    • http://teropisarazo.myartsonline.com/algebra_and_trigonometry_structure_and_method_book_2_online.pdfIn PDF document text
    • http://vejegaba.atwebpages.com/xapavedawi.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_off0000de95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE95 5476 bytes
SHA-256: 5b6540a939ed9b11c3929521be9216229672e8f1c92635025c2eb414cf03fb05
font_01_sfnt_off0000f14e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14E 9864 bytes
SHA-256: aaed28816968bd6e9e47662b1a17031e480234e34b1e1ce0a449ce777f88b5d2

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