Malicious PDF — malware analysis report

Static analysis result for SHA-256 90d5cb20237baded…

MALICIOUS

PDF

76.5 KB Created: 2021-03-10 23:18:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: d5558410467fbd42f44eb4a96db26230 SHA-1: 3a217c86c368cc2d73f49ea0ce480ba4fad712f8 SHA-256: 90d5cb20237baded728f4b9ad3f0ca1f741dd46c17799ec7025363b2e2ed4ae3
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains numerous external URIs, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure point towards a phishing attempt disguised as a dictionary, likely using a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ponafet.ru/award?keyword=illustrated+bible+dictionary+pdf PDF link annotation
    • http://zumanidoxup.medianewsonline.com/medium_big_green_egg_table_dimensions.pdfIn PDF document text
    • http://terem.space/fuzunijelurobexorowe145l5.pdfIn PDF document text
    • http://mybatut.store/84200049034imt9k.pdfIn PDF document text
    • http://beviluxenumiliv.mywebcommunity.org/which_of_the_following_molecules_can_exhibit_hydrogen_bonding_as_a_pure_liquid.pdfIn PDF document text
    • http://topijakalez.22web.org/ziwegutexes.pdfIn PDF document text
    • http://moradudipomibo.mypressonline.com/area_mixed_shapes_worksheet_answers_l1s1.pdfIn PDF document text
    • http://kuboduzuke.mypressonline.com/utep_accounting_degree_plan.pdfIn PDF document text
    • http://tanolugulutewu.medianewsonline.com/fufajat.pdfIn PDF document text
    • http://tidirakozodawon.getenjoyment.net/2759879949.pdfIn PDF document text
    • http://marketitaly.info/oxford_picture_dictionary_ebook_free6plc3.pdfIn PDF document text
    • http://ersoil.fun/beethoven_biography_worksheetu5v01.pdfIn PDF document text
    • http://kigurumi.org/jason_and_the_argonauts_storyz78o5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://299bc67c-4c9a-44ea-852c-18f2d39dca40.filesusr.com/ugd/954c8b_98719d57edcb4e58832c14efe40badcb.pdf?index=trueIn PDF document text
    • http://dezobod.onlinewebshop.net/what_is_the_lattice_energy.pdfIn PDF document text
    • https://6525eaf8-9a42-4119-9fb4-c3d475b3b78e.filesusr.com/ugd/80bfa9_8d21c127d43e4c5e92ce492eca15cd2b.pdf?index=trueIn PDF document text
    • http://mabukivo.epizy.com/basara_3_utage_android.pdfIn PDF document text
    • http://bubexixan.epizy.com/checkbook_register_template_free_excel.pdfIn PDF document text
    • http://gofumakexoj.onlinewebshop.net/fofitinifilavux.pdfIn PDF document text
    • https://01c4c9a3-ee74-4db9-a65d-799443b8dbf1.filesusr.com/ugd/a64c8c_3caceae0b8be4edf832a7bdbd13c7abd.pdf?index=trueIn PDF document text
    • http://desavoz.epizy.com/integrated_rate_law_practice_problems_and_answers.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_off0000eebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBB 5328 bytes
SHA-256: 5a84a813994785b555c195e71bdc282a5ef35e1631eabe28139378c00869b41b
font_01_sfnt_off000100e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E7 10440 bytes
SHA-256: 8f76ee20dff28bd3172445c7be1dd2865a839dd8ca91d3ffd7831f54a52ac921

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