Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3a661a4b1483232…

MALICIOUS

PDF

78.1 KB Created: 2021-03-21 05:15:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bdfa4ca84d9d4dfd4945bd6f710d4e78 SHA-1: b2851d449b0814511cdef6803c34bd1dc6e41b57 SHA-256: c3a661a4b1483232bae1ebcd5c28de15a9e6af0f59b9fb3454ad0949467502da
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and employing UTM parameters, indicative of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jottigo.ru/123?utm_term=bluetooth+printer+android+platform
    • http://heliusdesign.ru/advertising_and_integrated_brand_projnbn5.pdf
    • https://cdn.sqhk.co/lafuwexale/2giQhe0/art_therapy_programs_florida.pdf
    • http://registrat.space/secret_trust_common_law8txi7.pdf
    • http://easterthjg.com/how_to_do_a_scientific_presentationwmkdj.pdf
    • https://daluruxixofofi.weebly.com/uploads/1/3/1/3/131398394/rujopajuxekinurakana.pdf
    • http://world-wildshop.com/top_hr_interview_question_and_answer3rm71.pdf
    • http://pirikulifiwitif.iblogger.org/moto_360_2nd_gen.pdf
    • https://zavebunerug.weebly.com/uploads/1/3/4/3/134358754/a8423d.pdf
    • https://cdn.sqhk.co/baxotonad/fhiSZxz/lodowikonasujurebaxiv.pdf
    • https://cdn.sqhk.co/tamurikubol/b8vVUhh/oscar_the_grouch_costume_for_dog.pdf
    • http://differencecheats.net/67808375079d5nts.pdf
    • https://cdn.sqhk.co/pabopimi/vjiZYUb/ultimo_aggiornamento_android_note_8.pdf
    • https://cdn.sqhk.co/pisapaxosabo/5geFohg/stamped_cross_stitch_kits_amazon.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/babetafaperaxov/34519468399.pdf
    • https://7e073981-ad1c-4081-8dc0-76946ba36063.filesusr.com/ugd/c4f63d_22a7eb3f414340809349b0f44f11a2c7.pdf?index=true
    • https://9480ebe7-8096-4165-94d5-b35dd525e9f4.filesusr.com/ugd/07b43d_4e52069a8b1b40dc959c059a67b6b908.pdf?index=true
    • https://s3.amazonaws.com/vukujidor/3d_cupboard_design_software_free.pdf
    • http://kudugumokob.epizy.com/division_worksheets_grade_5_common_core.pdf
    • https://e5720c39-3c1c-4a52-9be9-509675281b5a.filesusr.com/ugd/0010c8_c691ff88bb4d49c4882036e828df962d.pdf?index=true
    • https://s3.amazonaws.com/jebokizez/adding_and_subtracting_integers_worksheet_8th_grade.pdf
    • https://c1e70603-6ca1-47bc-880b-b60d7d434995.filesusr.com/ugd/df625d_c5bef705508043848196b45b3403c988.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f267.bin
d455d4d74d49507c6f8f1fde038b1a8799b23a361800fb94e75d26e4af612234		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF267 5152 bytes
font_01_sfnt_off000103c7.bin
ccbedd0c51fb0ffafc37a08b773722bc1b8237d6efcff56f7de5eee4be46d7c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103C7 11360 bytes

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