Malicious PDF — malware analysis report

Static analysis result for SHA-256 c408c9ebac895ab0…

MALICIOUS

PDF

71.9 KB Created: 2021-02-20 14:38:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 192bf69a918f5f26bf8deb020608213b SHA-1: 2480ac7d8dca10863481e70163c735cca8234f7c SHA-256: c408c9ebac895ab0668647042c2b8b791c6467b1b09921c3425fd60c93a794b6
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 appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains strings related to search queries, reinforcing the lure mechanism.

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://leonvi.ru/wb?keyword=how%20to%20find%20year%20of%20cat%20forklift PDF link annotation
    • http://trening-ekaterinodar.ru/how_to_reset_a_tankless_water_heaterj5zwt.pdfIn PDF document text
    • https://kijidagidopijub.weebly.com/uploads/1/3/0/7/130776406/a1da2.pdfIn PDF document text
    • https://bivolureru.weebly.com/uploads/1/3/4/5/134583024/9a4d9320fb42b.pdfIn PDF document text
    • http://totalcreditreport.info/define_propositional_knowledge_tokfgkp2.pdfIn PDF document text
    • http://uniques.space/sokanejapufamuvafpflvk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497395/normal_60109410ced0c.pdfIn PDF document text
    • http://1xbet-registr.site/harry_potter_1_castleh530d.pdfIn PDF document text
    • https://cdn.sqhk.co/kuderoxuz/dhBjbhe/shark_ion_robot_r85_mapping.pdfIn PDF document text
    • http://vinograd.io/antique_koken_barber_chair_repairbu4tg.pdfIn PDF document text
    • https://juziwujaxizeze.weebly.com/uploads/1/3/4/6/134685910/4893591.pdfIn PDF document text
    • https://cdn.sqhk.co/wovupeni/eeifZ2O/list_of_1970s_hard_rock_music_songs.pdfIn PDF document text
    • http://iuts.space/valkyrie_profile_ps1_romirodz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zalezir.epizy.com/transformers_4_grner_autobot_name.pdfIn PDF document text
    • http://bunisanabasa.epizy.com/rezobetowivodufakebave.pdfIn PDF document text
    • http://pevivudawof.epizy.com/android_file_transfer_para_mac_mojave.pdfIn PDF document text
    • http://tumizasikoxef.rf.gd/ingenuity_baby_swing_stops_swinging.pdfIn PDF document text
    • http://wirudulobaga.epizy.com/23356101629.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_off0000de9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9F 5056 bytes
SHA-256: 5717f35897efc2ea2608064e95e547eddda9d38183964c7c59cf6b6e866a7f4f
font_01_sfnt_off0000effc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFC 10168 bytes
SHA-256: 6d7a8292bf663b4d4cda57fff51e7ca7a67c12dedd07929ac11c50b5172e2b93

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