Malicious PDF — malware analysis report

Static analysis result for SHA-256 6788335b1651c6ab…

MALICIOUS

PDF

74.2 KB Created: 2021-04-22 04:09:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: b4ee301bd218e1d114becc177ee5da0a SHA-1: d3ac30e6f88e91cb30daf6aacbfbe77c3b6b200d SHA-256: 6788335b1651c6abf00636a3f0497fb2e5bd5681e640dfd830883567eb7e1a27
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The heuristic firings indicate this PDF is designed to redirect users to malicious infrastructure, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest an attempt to exploit users through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 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.
  • 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=the+vampire+diaries+stickers In PDF document text
    • https://cdn.sqhk.co/rubuxupab/F0jbmjj/foxovajogurena.pdfIn PDF document text
    • https://tepiduti.weebly.com/uploads/1/3/5/9/135974730/db5a4c.pdfIn PDF document text
    • https://rinefoza.weebly.com/uploads/1/3/4/8/134883618/9d438eb47f40.pdfIn PDF document text
    • http://bumasujofoj.getenjoyment.net/razibenusad.pdfIn PDF document text
    • http://tomokatixo.mygamesonline.org/yaesu_ft-450d_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/nedivixozu/gfhgidr/best_weather_station_for_home_use.pdfIn PDF document text
    • https://naxosunibeg.weebly.com/uploads/1/3/4/6/134676516/98751.pdfIn PDF document text
    • http://tozemudezajif.mygamesonline.org/47281210643.pdfIn PDF document text
    • https://cdn.sqhk.co/xutujipux/hjjghfC/parkour_race_free_online_game.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/fowikorejodi/iit_jee_maths_books_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vokeri/enterobacter_cloacae_treatment_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/mujevubutukoxu/gusavuxevigepokafunotemi.pdfIn PDF document text
    • https://s3.amazonaws.com/vexosafugunu/situzepizaze.pdfIn PDF document text
    • https://s3.amazonaws.com/wenobagupexekap/48889999598.pdfIn PDF document text
    • https://s3.amazonaws.com/bezutu/best_positive_thinking_books_for_young_adults.pdfIn PDF document text
    • https://s3.amazonaws.com/purufiz/business_presentation_google_slides_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/39448901277.pdfIn PDF document text
    • http://ziwemasux.myartsonline.com/57729133244.pdfIn PDF document text
    • https://s3.amazonaws.com/sutawowirosuvuv/2_filters_in_one_excel_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/sumesawoxajew/59110345459.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifumofelu/25486213310.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzaganog/rexaluzixija.pdfIn PDF document text
    • https://s3.amazonaws.com/mujesogi/77974098747.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD26 5356 bytes
SHA-256: 704b54638d3942ec7bcff021b7552b806a6b0966ac98f9ae13717b3212a17f74
font_01_sfnt_off0000df31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF31 10828 bytes
SHA-256: c5e033fb07d180d06462a8a3b2529d7860dbb13c59f8ad23b9a2444c412d0176
font_02_sfnt_off00010449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10449 16220 bytes
SHA-256: 69e435d5fe79a100924464414ebcedb4cea06aeed1c7d92a80322d5a9a46033c

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