Malicious PDF — malware analysis report

Static analysis result for SHA-256 56e4e3cf0f11b398…

MALICIOUS

PDF

125.8 KB Created: 2021-03-12 15:21:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 4411ee05bce184cf77c75be46208288f SHA-1: 27b76f79c7ea958a8011f89411eac5e59f6d9375 SHA-256: 56e4e3cf0f11b398e16e603c8309e39fbcc851400eab6e4bf8b038cfd212bc55
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are flagged as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. The document body, though heavily obfuscated, contains strings related to hardware upgrades, suggesting a lure to entice users to click on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://seumenha.ru/strik?utm_term=gateway+dx4860-ub32p+cpu+upgrade PDF link annotation
    • http://xozonline.ru/gidanetikiwogafexisdilp5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406463/normal_6025e6c6a4ce0.pdfIn PDF document text
    • http://allwoman.site/galaludenadozefowizaduzon13fmg.pdfIn PDF document text
    • http://zekabivalejasaj.22web.org/nalafedamuzad.pdfIn PDF document text
    • http://mexicotop.xyz/gegumbq0za.pdfIn PDF document text
    • http://kismyketio.com/43347053849s2i3n.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447098/normal_5fca278882ef9.pdfIn PDF document text
    • http://gonaxepafa.iblogger.org/55235134111.pdfIn PDF document text
    • http://tesar-krd.ru/java_arrays._fill_performancex0j1j.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451206/normal_603f469266977.pdfIn PDF document text
    • http://submonster.xyz/exercice_calligraphie_adulte__impri6m9it.pdfIn PDF document text
    • http://ipoteka.net/83566462481ju03e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478415/normal_5fd0d84788be5.pdfIn PDF document text
    • http://lodomujimujug.mywebcommunity.org/vajojipizebi.pdfIn PDF document text
    • http://yourdesk.website/mexubazusojibilusa4agk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381964/normal_5ff434948943d.pdfIn PDF document text
    • http://bigtittybella.com/how_to_replace_logitech_mouse_receiverf2cfe.pdfIn PDF document text
    • http://kavelizopepi.mywebcommunity.org/bwv_1006a_prelude_guitar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d6d3a1c5-32ce-46e9-ae92-c5b8d84d65d9.filesusr.com/ugd/a3b54b_07bf914241634ef3aa86fc5b7f308156.pdf?index=trueIn PDF document text
    • https://40e214c1-1950-44e8-a195-e2c6eeb23253.filesusr.com/ugd/a517f4_9efbdf765fc546faa02db9892fa26f88.pdf?index=trueIn PDF document text
    • http://roveramo.atwebpages.com/kagoguzopexasudelesa.pdfIn PDF document text
    • http://lugenizuridaj.atwebpages.com/lab_apparatus_and_functions.pdfIn PDF document text
    • http://rabuwupitakif.rf.gd/badlapur_full_movie_480p_worldfree4u.pdfIn PDF document text
    • https://0778d94d-b67d-49c3-8f6f-43f52d6edec9.filesusr.com/ugd/b85eb0_2a1c939475e041a78f61f607b945a72b.pdf?index=trueIn PDF document text
    • http://jamosafiseb.rf.gd/18689647504.pdfIn PDF document text
    • https://c5e26362-acc3-4c40-9db4-ce0cbd355080.filesusr.com/ugd/681527_1684d4dc55804868a10a24193614cc73.pdf?index=trueIn PDF document text
    • http://rajiwewovipu.epizy.com/ancestral_quest_15_user_manual.pdfIn PDF document text
    • http://logiweliziweje.onlinewebshop.net/manual_para_caja_registradora_royal_500dx.pdfIn PDF document text
    • https://1cbf0fd9-62af-4102-a3dc-982f361539e7.filesusr.com/ugd/bfbc46_1c1331bfac694882a3fd207d6c5e5a78.pdf?index=trueIn 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_off0001a900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A900 6368 bytes
SHA-256: a68515acbd89469f6cb500a39441a5130f00e2de67ae244af2bd740aff026ef5
font_01_sfnt_off0001bedc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BEDC 13048 bytes
SHA-256: 1379d81bfdd145ab539ac78a3a53993d5aec23e63fc3fb621d1dd33e43d54f6b