Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bdb967d616bb784…

MALICIOUS

PDF

76.3 KB Created: 2021-05-03 16:17:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: fa16d75c255ee0ed85fd127c364142ef SHA-1: cdbb56a87c9eac75953516b1bb1d4e340198d74c SHA-256: 1bdb967d616bb784683ba51eeb0631b3a66c31e8327d9c7e238b5008fa2feeb8
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous external URLs, many hosted on disposable domains. The presence of embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/strik?utm_term=excellence+resort+playa+mujeres+restaurants PDF link annotation
    • http://korecos.ru/how_to_get_honeywell_thermostat_off_holdl9hjm.pdfIn PDF document text
    • http://helper-badges.com/49844825687fvpdf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381751/normal_5fd9f37b80f6a.pdfIn PDF document text
    • http://datingdate.site/judge_dredd_vs_zombies_mod_apk_downloadxvp16.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403117/normal_5feeca25e43ce.pdfIn PDF document text
    • http://dokozem.iblogger.org/charlie_and_the_chocolate_factory_book_quotes_with_page_numbers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376869/normal_5fdc14ecdf2d8.pdfIn PDF document text
    • https://cdn.sqhk.co/xororasomig/BU8Nhaf/arena_of_valor_patch_notes_september.pdfIn PDF document text
    • https://cdn.sqhk.co/voxobidivel/eJP0Ehe/53377189761.pdfIn PDF document text
    • http://byt-upak.ru/what_are_venial_sins_in_the_catholic_churchmv7s7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://degejukifukux.epizy.com/paraphrase_definition.pdfIn PDF document text
    • http://ferozar.rf.gd/sufoxutepirebanoja.pdfIn PDF document text
    • http://suzufesa.epizy.com/bernal_diaz_del_castillo.pdfIn PDF document text
    • http://luwiworim.epizy.com/82002875846.pdfIn PDF document text
    • http://pagosunizuboroz.epizy.com/39996557319.pdfIn PDF document text
    • http://fasujenijasezos.rf.gd/valubosipadebemigitoko.pdfIn PDF document text
    • http://dujikiwereka.epizy.com/onn_dab_radio_bluetooth_speaker.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_off0000ea38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA38 5284 bytes
SHA-256: cfb442d4dd86292abdf9ddccbf077e96920d192b7da04f4646fd18ba68fcf8ad
font_01_sfnt_off0000fc2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2B 11112 bytes
SHA-256: 79e8555f0dfcfcd2cf4c7fd8ac4a29b2a15b259b8636710246770578a553346e

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