Malicious PDF — malware analysis report

Static analysis result for SHA-256 7db4702c92e1fda5…

MALICIOUS

PDF

81.8 KB Created: 2021-03-27 11:19:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c88c01d33f8040752a822dcfb5c63fb4 SHA-1: b101ded9539f96d3e8763f33af0d0f1a583e5601 SHA-256: 7db4702c92e1fda526af5e7379ba6a49050d256c9a6b710f53a71c24bad5636a
184 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically indicating it's a phishing or redirector. The embedded links, such as `https://dafemum.ru/wix?keyword=frases+de+musicos+gospel`, point to known malicious redirector infrastructure. The document body is heavily obfuscated, but the presence of numerous links suggests an attempt to lure users to external, potentially harmful, sites. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/wix?keyword=frases+de+musicos+gospel In PDF document text
    • https://cdn.sqhk.co/lixipadiwel/hsVjhij/96660387417.pdfIn PDF document text
    • https://cdn.sqhk.co/javabufe/gijbAyj/calories_2_sheets_lasagna.pdfIn PDF document text
    • http://wovoradomumakil.medianewsonline.com/73530261316.pdfIn PDF document text
    • http://kizunawinim.getenjoyment.net/chair_design_book.pdfIn PDF document text
    • http://kaboliwup.mypressonline.com/arbitrage_trading.pdfIn PDF document text
    • https://cdn.sqhk.co/navimoxa/viavUgg/song_association_elle_blackpink.pdfIn PDF document text
    • https://cdn.sqhk.co/bipadifudame/gjyievi/kalagalifabupuwopokir.pdfIn PDF document text
    • https://cdn.sqhk.co/bajowekununa/haggss5/bang_bang_bang_big_bang_easy_lyrics.pdfIn PDF document text
    • http://luloxijemise.medianewsonline.com/bengal_famine_1943.pdfIn PDF document text
    • https://cdn.sqhk.co/xexisini/nl68ggh/medebitakokivotusimunefab.pdfIn PDF document text
    • http://kaboliwup.mypressonline.com/sat_review_courses_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/girolivudafo/lhhhcif/68473332304.pdfIn PDF document text
    • https://cdn.sqhk.co/fanekizesedi/igjdQif/xegivetogagip.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffde548c-595a-48cb-a65a-6dfc6106f029/miniature_dachshund_puppies_for_sale_pensacola_fl.pdfIn PDF document text
    • https://s3.amazonaws.com/vogubivajavofu/18404623850.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55a78997-a849-4bb6-997f-5e14f6f4d25f/8016763599.pdfIn PDF document text
    • http://luvabokinoleg.onlinewebshop.net/tokikidin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8a8670a-7082-4eec-9931-af3a0e4d35b3/86912456592.pdfIn PDF document text
    • https://s3.amazonaws.com/nitajosasa/gaporopedakibuxegaxoga.pdfIn PDF document text
    • https://s3.amazonaws.com/murudute/50053655131.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C8 5348 bytes
SHA-256: 91492f9868dd5c2099b070f35d15b212625ff187f5c0b18cb668c892e442351d
font_01_sfnt_off000105d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D6 2512 bytes
SHA-256: 73dc7d755d8e24f0f73406b3109777df995c339bb82b7c17e06a9c6730f40b89
font_02_sfnt_off0001109f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1109F 13296 bytes
SHA-256: 6f219ce301258240b6d0c07c6a383d4656e9b62ab9e54f013dc0f918cd3b313b