Malicious PDF — malware analysis report

Static analysis result for SHA-256 fff0ff04897c2db3…

MALICIOUS

PDF

79.7 KB Created: 2021-03-16 09:47:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: dca1a1f30b6d37027cb32914cf83aa5a SHA-1: 90b6e34c0c825eba5562a362cac421a150968ea7 SHA-256: fff0ff04897c2db3c74db7c7eea66fa63805114bfbd9c12225d0ef6af18b2390
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as phishing and a trojan. It contains numerous embedded URLs, with a primary suspicious URL pointing to 'seumenha.ru'. The document body, though heavily obfuscated, suggests a lure related to filling out a form ('Carta poder para llenar en computadora'), which is a common tactic for phishing or directing users to malicious sites. The presence of many external links, some on disposable hosting, further supports a link farm or phishing campaign.

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
  • 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=carta+poder+para+llenar+en+computadora PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4390323/normal_6043ea6932eef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483591/normal_603c25170cb78.pdfIn PDF document text
    • http://tesocoin.online/do_natsu_and_lucy_kiss_in_the_anime4habz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446930/normal_604e0680980d2.pdfIn PDF document text
    • http://bubuwir.22web.org/the_easy_5-ingredient_ketogenic_diet_cookbook.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449984/normal_60419efc5c975.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475571/normal_604b4008ab74b.pdfIn PDF document text
    • http://winfreeiphone.xyz/software_project_management_onlinez3e6b.pdfIn PDF document text
    • http://winoraama.fun/silhouette_cameo_3_software_deutsch6v72c.pdfIn PDF document text
    • http://icub.tech/buen_viaje_level_2_workbookbm04q.pdfIn PDF document text
    • http://wordwild-store.com/17981212233aevc0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393499/normal_5fe270cabbe49.pdfIn PDF document text
    • http://youla-24.cc/what_do_the_lights_on_my_mini_dashboard_meannfsg1.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/89a48e20-46f0-4866-8b70-6a3548aa2db8/why_is_my_smart_tv_not_connecting_to_internet.pdfIn PDF document text
    • http://jolopegewedagil.epizy.com/club_car_xrt_1550_service_manual.pdfIn PDF document text
    • http://wenafebadutaw.rf.gd/how_to_make_cover_art_for_podcast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b076b19-eab7-49fe-ada8-8e0b4aa9fe56/windows_10_free_download_for_macbook_pro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b6da2d9-626e-4e4c-8cfd-983169c21c03/32273393425.pdfIn PDF document text
    • http://kofupugixujodin.epizy.com/oxford_english_spanish_dictionary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b2f7d3a-d281-4b22-875c-9d84e45a25f9/41192743872.pdfIn PDF document text
    • http://fukasutatota.rf.gd/19144453258.pdfIn PDF document text
    • https://www.google.com/search?q=ancient+Greece+Rome+religion+governmentIn PDF document text
    • https://www.google.com/sIn 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_off0000fa94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA94 4948 bytes
SHA-256: 485d6491bc77c5df425e942070312b826444bb60c6522043a0111e93b6930d69
font_01_sfnt_off00010b50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B50 11040 bytes
SHA-256: a54b9d4da5f2aedafdbfc36c7c9750733a2091b4c1a199ebec2590864c987637