Malicious PDF — malware analysis report

Static analysis result for SHA-256 f592b912b2b09a38…

MALICIOUS

PDF

80.6 KB Created: 2021-02-25 13:01:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 78d38df60f371f6481383f747dd4cc11 SHA-1: 5fb8315e50f479e2e1285095c22af8bde1cadd66 SHA-256: f592b912b2b09a3859463019847e75f15db622ea7eca7d44ba7df15c15e8effe
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating a phishing or redirection attempt. It contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure at 'https://yafferge.ru/123'. The document body, though heavily obfuscated, appears to contain metadata related to its creation, suggesting it was generated programmatically to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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://yafferge.ru/123?utm_term=allergen+menu+for+panda+express In PDF document text
    • http://repovor.22web.org/alquran_pc_software.pdfIn PDF document text
    • http://tixesikixux.mygamesonline.org/56207497884.pdfIn PDF document text
    • https://cdn.sqhk.co/sotatixorawi/b9Hggge/hotels_near_oconee_state_park_sc.pdfIn PDF document text
    • http://derilezin.sportsontheweb.net/hp_laserjet_p2035n_manual_ip.pdfIn PDF document text
    • http://nexekuwa.22web.org/sibabigidasowate.pdfIn PDF document text
    • http://muzibatixabu.mypressonline.com/metric_mania_worksheet_answer_key.pdfIn PDF document text
    • http://vijexibat.mywebcommunity.org/44258924584.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://pikubub.onlinewebshop.net/zojubimapeduvexobajem.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwenoxuzasila/diablo_2_patch_1.13_download_deutsch.pdfIn PDF document text
    • https://s3.amazonaws.com/rolefosiju/mozirawimejezawususof.pdfIn PDF document text
    • http://kedisijusa.onlinewebshop.net/how_do_i_calculate_pool_pump_flow_rate.pdfIn PDF document text
    • http://pusevim.epizy.com/billyoh_tower_playhouse_instructions.pdfIn PDF document text
    • http://biforobajimebug.epizy.com/beginner_fitness.pdfIn PDF document text
    • http://jigiwema.epizy.com/pdf_market_leader_business_english_course_book.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e55e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55E 5172 bytes
SHA-256: 86c487eba6b560cc9b23472e64da40ba5808c1ce815f075cf898dfec2e09a29c
font_01_sfnt_off0000f6ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CE 2024 bytes
SHA-256: dc37461816ec92f0ed1316601fd5c6b06f5c1a5be203c138b3c3c6cdf5da3806
font_02_sfnt_off00010066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10066 11328 bytes
SHA-256: 63e16793884c3754d6d29ff7c73993b90cf2e56ebadc0a9c22b9c47e3d4a5ae1
font_03_sfnt_off000126ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126AD 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176