Malicious PDF — malware analysis report

Static analysis result for SHA-256 13e1aed657c088c5…

MALICIOUS

PDF

80.5 KB Created: 2021-04-15 20:58:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd4702ec1571ffe6a4d25dee486101a5 SHA-1: e37e78ad7f7e0708074df5cf53be7bd2b154b1e5 SHA-256: 13e1aed657c088c5bac4fe295c9c483d323530c2df9b3203c2a7250e95eb5ef8
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, many of which point to unknown or potentially malicious domains, suggesting a link farm or phishing attempt. The primary malicious URL identified is https://pelibifir.ru/strik. The presence of embedded JavaScript, though not explicitly detailed here, is a common vector for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://pelibifir.ru/strik?utm_term=what+is+the+point+of+a+quit+claim+deed
    • https://fubagodesipura.weebly.com/uploads/1/3/4/3/134326772/jidelovoj.pdf
    • https://cdn.sqhk.co/rorajakura/Zkjfhbl/pottery_3d_design.pdf
    • https://cdn.sqhk.co/bepifopid/DTmrQhd/84255019572.pdf
    • https://vazanopika.weebly.com/uploads/1/3/4/8/134896022/pifed.pdf
    • http://xenejesujotolud.mypressonline.com/belajar_bahasa_jawi.pdf
    • https://cdn.sqhk.co/vibifexode/RQrS591/wolem.pdf
    • http://kigirifaduguv.getenjoyment.net/adobe_illustrator_cs6_tutorials_in_urdu.pdf
    • http://ziwigosopijulal.mygamesonline.org/prodigy_autocode_talking_diabetic_meter.pdf
    • https://faraxebeg.weebly.com/uploads/1/3/4/4/134475962/346767.pdf
    • http://kesuvajeb.scienceontheweb.net/flight_of_the_bumblebee_sheet_music_clarinet.pdf
    • https://mivifasev.weebly.com/uploads/1/3/1/4/131483453/6c91b9498027e7a.pdf
    • https://bedejoxinen.weebly.com/uploads/1/3/1/1/131163540/915490.pdf
    • https://cdn.sqhk.co/podoxato/hjgxGgf/boss_songs_pagalworld_2018.pdf
    • https://cdn.sqhk.co/negapevu/hEtShf0/lefuxitizovanip.pdf
    • http://lumobumekola.getenjoyment.net/archinteriors_47.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b4865e52-1de0-4434-a04d-acb40a0f667d/photography_book_publishers_australia.pdf
    • https://uploads.strikinglycdn.com/files/dec4fe4a-3fb4-4ed0-be65-ed9757785f24/logitech_surround_sound_speakers_z506_software_download.pdf
    • https://uploads.strikinglycdn.com/files/d242c1a0-de4c-4428-a244-dd2ebf6fc45a/beats_studio_wireless_replace_ear_pads.pdf
    • https://uploads.strikinglycdn.com/files/3bd3d37e-e8d2-45b6-9348-e8cd42f2ef0e/13940567735.pdf
    • https://0a38098d-26c8-4844-ab0b-2dfc398d7f8d.filesusr.com/ugd/fffd55_271412a5c60844f4a6a7428cd71243a5.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d28bb640-3e00-406c-a76e-5360f6639faf/kagijasonilujesidadiseza.pdf
    • https://2e81f42f-67f9-46a9-89e2-a5f3ab3b03ee.filesusr.com/ugd/f138f5_e15ed4ef19a44ed58d4b22f3c0259f76.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_off0000fc7b.bin
a326d7ddea7b455187c84e30a472dafec7225829f45308de921978f7687410fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7B 5440 bytes
font_01_sfnt_off00010ee7.bin
2a993dfcc608d39963c6c4e5047d0b1421c1e0a2d632205b4782594a3342c415		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE7 10936 bytes

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