Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b4d753b0d3f689b…

MALICIOUS

PDF

78.9 KB Created: 2021-03-08 12:09:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 6b41a06ce7fc228578ab220ca0aa12fd SHA-1: e938c77d00b7d8dc8f655752670d611524e2adb6 SHA-256: 5b4d753b0d3f689bb47e9bddf6cebd392818dfde40de9b8ad824955bf8c5983c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://druttle.ru/wix?keyword=fun+math+warm+ups+6th+grade PDF link annotation
    • https://cdn.sqhk.co/libobivole/gj2qdgj/somowugemamam.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417029/normal_5fed021c7f1a3.pdfIn PDF document text
    • http://xexejidabame.22web.org/how_to_clean_hp_7520_printhead.pdfIn PDF document text
    • https://cdn.sqhk.co/foxoxaze/Figgf8q/45857884882.pdfIn PDF document text
    • http://xonitaj.mywebcommunity.org/zimuvufakinen.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvebopeweb/zyhbkMq/69159215089.pdfIn PDF document text
    • https://cdn.sqhk.co/fodexuxefeba/hdgfjjq/brilliant_distinctions_vs_alle.pdfIn PDF document text
    • https://cdn.sqhk.co/pufojoloz/czaGhh0/4287993956.pdfIn PDF document text
    • http://mavigawika.scienceontheweb.net/70039218914.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369930/normal_5fcc229dea97d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417315/normal_5fd7c74b2a4a1.pdfIn PDF document text
    • http://delinapod.mypressonline.com/2._what_are_the_reactants_and_products_of_cellular_respiration_and_photosynthesis.pdfIn PDF document text
    • http://gididowofugu.iblogger.org/sadob.pdfIn PDF document text
    • http://jekefidaz.mygamesonline.org/planificacin_estrategica_de_mercadotecnia.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://duvodix.myartsonline.com/clicker_products_klik2_programming_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/726957ce-7bfc-4463-a53c-9a214ca62b35/sensory_images_examples_words.pdfIn PDF document text
    • http://piwolimosopobu.myartsonline.com/lefene.pdfIn PDF document text
    • http://besogigususatu.epizy.com/dunemomawobeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d68ed743-b23e-4ae6-9cb9-fa0af7ef2be6/how_to_use_bluetooth_on_crosley_record_player.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2c3435e-5a79-45b1-8f36-9518b35e37d5/43629892353.pdfIn PDF document text
    • http://zatafefot.rf.gd/8493636580.pdfIn PDF document text
    • http://wawopuviginase.epizy.com/what_are_some_examples_of_dramatic_irony_in_act_4_of_romeo_and_juliet.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_off0000f6d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D8 5544 bytes
SHA-256: 716dba487f2f4fa0bb00d16797c242ddfd27c7bff1962887eacf6d21c18235a8
font_01_sfnt_off00010997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10997 10780 bytes
SHA-256: aa61b048ef1a43a8d65f782e5f21a18e73f79ff7e571899fb74bd2455f36d18f

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