Malicious PDF — malware analysis report

Static analysis result for SHA-256 507155baa55b0372…

MALICIOUS

PDF

83.4 KB Created: 2021-04-22 20:05:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 41dd13446dce56ca14f77dacf50d36a9 SHA-1: 2b2d4eb6a1aaa8d99fe726e6031167444daa3470 SHA-256: 507155baa55b03727aa4abaa4e45d306e054144ec08a3907fb39a990bd50b8dd
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, pointing to various PDF files. One of these links, 'https://nipisod.ru/strik?utm_term=can+dbt+help+with+anxiety', is directly embedded and likely serves as the primary lure. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing or trojan PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/strik?utm_term=can+dbt+help+with+anxiety
    • http://dotuzodozo.22web.org/nugilojefejosavalalovanip.pdf
    • https://nuropasidax.weebly.com/uploads/1/3/5/3/135393275/9256131.pdf
    • https://gimogelego.weebly.com/uploads/1/3/4/6/134601730/2a329e3167142.pdf
    • http://saporik.scienceontheweb.net/finite_element_method_programming_matlab.pdf
    • http://kuvenumine.mygamesonline.org/apical_meristem_culture.pdf
    • https://pufedoxavode.weebly.com/uploads/1/3/4/6/134613169/xapesanogufev-jomov.pdf
    • http://tipofeliluget.medianewsonline.com/88778976197.pdf
    • http://zukoretevir.medianewsonline.com/sijoguwenibe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/d93bc005-9b8a-4d07-81ad-d58bf98bccbb/irobot_240_braava_jet_cordless_robot_vacuum_cleaner.pdf
    • https://uploads.strikinglycdn.com/files/ddf8358f-89c8-4db5-9515-9fd02375d835/tuxuruzigagilibumumebene.pdf
    • https://uploads.strikinglycdn.com/files/5edb351f-c2c8-4008-8d14-6d0670feedab/pukerudoxunitaxupuluguso.pdf
    • http://mujewuliruj.epizy.com/convert_base64_string_to_android.pdf
    • https://s3.amazonaws.com/pokixovuxik/mafaraxoguxax.pdf
    • https://uploads.strikinglycdn.com/files/b31540da-8e2d-4c5e-9e23-5aa46fdf1eac/39341322881.pdf
    • https://s3.amazonaws.com/buganabowumujef/tekemexejafuv.pdf
    • https://uploads.strikinglycdn.com/files/7bd75c58-4c92-41bd-b1a5-67c7378fa1bb/dexugodoza.pdf
    • http://balubusepebibi.rf.gd/cognitive_dissonance_festinger.pdf
    • https://uploads.strikinglycdn.com/files/b3e9beb9-0ea3-4f90-b5cd-265fa4c164be/how_do_i_reset_my_iphone_8_to_factory_settings_without_the_passcode_or_computer.pdf
    • https://uploads.strikinglycdn.com/files/9dea2463-4af2-4ad5-aad1-3b15870db0a9/emerson_32_inch_tv_wall_mount_screws.pdf
    • http://vilaxetewutino.epizy.com/gummy_bear_recipe_with_gelatin_sheets.pdf
    • https://s3.amazonaws.com/zukogi/momitoboxasipabenama.pdf
    • https://s3.amazonaws.com/boxalewijim/filehippo_itunes_free.pdf
    • https://uploads.strikinglycdn.com/files/d51b47e3-3f19-41af-b38c-6c9dabc80ca0/skyrim_how_to_install_mods_on_cracked_version.pdf
    • https://uploads.strikinglycdn.com/files/f9a60d71-3e4c-4a16-acba-fff7650983f2/25979889140.pdf
    • https://s3.amazonaws.com/rikolesafuwofar/vamerenalobafo.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa0e.bin
9978ee52422e0ba4b39cf5f868bca8c946775799a69621daf40132039689cad7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0E 4876 bytes
font_01_sfnt_off00010ab5.bin
9a642d9b5023aca1d3a8b9608042f4d03337b92ec94e7a6caaa4bc62162d20f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB5 11088 bytes
font_02_sfnt_off00013078.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13078 4324 bytes

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