Malicious PDF — malware analysis report

Static analysis result for SHA-256 4443c20f4948987c…

MALICIOUS

PDF

69.3 KB Created: 2021-03-31 05:43:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 06d15bd16062098218210deebb3d97fd SHA-1: 99c802fdf345811c3c45b6897991930a6df49c9f SHA-256: 4443c20f4948987c4e0314ac509f916fa9aebb4b9ff70b4a03b0c66779cadb20
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics, including a high ML score and ClamAV detection as a phishing trojan. It contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a tactic to obscure the true destination or distribute multiple malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 http://lipexifinidoda.scienceontheweb.net/noxujimaponoxitofaziwov.pdf In PDF document text
    • http://zuzorovix.scienceontheweb.net/soduxoliluvenikivaxasape.pdfIn PDF document text
    • http://arm-watch1.club/13153261103q33gm.pdfIn PDF document text
    • http://it50disconto.pro/whirlpool_model_wrf535smbm00_filter_locationbh1pr.pdfIn PDF document text
    • http://gedatidigog.sportsontheweb.net/how_to_always_allow_adobe_flash_in_chrome.pdfIn PDF document text
    • http://daravto18.ru/what_are_the_books_of_the_ethiopian_orthodox_biblep8o3c.pdfIn PDF document text
    • http://instapriz.online/what_child_is_this_christmas_song_instrumental7m7zq.pdfIn PDF document text
    • http://latencfsrt.space/vocabulary_workshop_level_c_unit_4_answers_completing_the_sentence5ayyp.pdfIn PDF document text
    • http://xulikugo.iblogger.org/33432186026.pdfIn PDF document text
    • http://mikovil.mywebcommunity.org/behaviourist_theory_of_learning_in_education.pdfIn PDF document text
    • http://dagoseguvidita.22web.org/leukemia_coding_guidelines.pdfIn PDF document text
    • http://dfds.in/qcy_j132_price7n6nq.pdfIn PDF document text
    • http://kawolamekepe.22web.org/85644214065.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/dN4lCoxrs6M/wb?keyword=sarah%20plain%20and%20tall%20reading%20levelPDF link annotation
    • http://vavijirodujozi.rf.gd/battle_realms_untuk_hp_android.pdfIn PDF document text
    • https://de99934f-f465-4d69-af5e-14f317c0a7c6.filesusr.com/ugd/4fea5c_1843a10c93034eb1b3c95e6aece2c531.pdf?index=trueIn PDF document text
    • http://padegijogul.atwebpages.com/76056534348.pdfIn PDF document text
    • https://650c977b-0274-48a2-8498-43c0efc39f4e.filesusr.com/ugd/dbad32_86beb32c69fc4f37a666f794d578d256.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mudurixo/structural_adjustment_programme.pdfIn PDF document text
    • http://tusigod.epizy.com/11584102889.pdfIn PDF document text
    • https://7ef5d8b8-74ac-4e0a-b0a0-fa61ca6462a8.filesusr.com/ugd/23e9be_7047ee5333cb4acebe4d1731b1ade755.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/taguxif/arikil_pathiye_malayalam_video_song_free.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_off0000d106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD106 5208 bytes
SHA-256: f99f0f1037d86de9cdc19b6b87a1949ede616d60155ec78b5997b6ded2208ddf
font_01_sfnt_off0000e2b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B8 10944 bytes
SHA-256: 67d7c8dfb925e848cd455a01fe1beaff73563b09e2618e8ad789165723d4a21e

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