Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7c165bb20f56633…

MALICIOUS

PDF

88.3 KB Created: 2021-03-17 05:29:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 1cb43b572911702367bc63b75ea5eec3 SHA-1: f3a475cc62f1275920bd368885f8a46c13bd27ca SHA-256: a7c165bb20f56633bacb4946b9b776e17657cdba68bbd2e6aa7020fda84502ed
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 high likelihood of malicious intent. It contains numerous embedded URLs, with several pointing to disposable hosting and employing UTM parameters, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains text related to 'basic electrical engineering book pdf in tamil', which is likely a lure to entice users to click on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://gimoguvi.ru/strik?utm_term=basic+electrical+engineering+book+pdf+in+tamil PDF link annotation
    • http://axecheat9.xyz/how_can_scrum_master_gain_influence_without_authorityfq6i8.pdfIn PDF document text
    • http://chaptejvxz.fun/the_doors_of_perception_and_heaven_and_hell_downloadzotf0.pdfIn PDF document text
    • https://cdn.sqhk.co/getabemuto/hgjfLji/nivudijikadafena.pdfIn PDF document text
    • http://specrazreshenie.com/flightradar24_flight_tracker_apk_freehwoer.pdfIn PDF document text
    • https://cdn.sqhk.co/sovajepuxe/wjhgjij/67369406749.pdfIn PDF document text
    • https://cdn.sqhk.co/dofexoxev/GtVjcjf/2681582219.pdfIn PDF document text
    • http://rezotu.xyz/autodesk_autocad_lt_2019_tutorialq1rzy.pdfIn PDF document text
    • http://worabipupe.mypressonline.com/dumobekegudide.pdfIn PDF document text
    • http://onesmall.space/the_art_of_taking_action_gregg_krechs8q8s.pdfIn PDF document text
    • http://xakaderinetatu.mygamesonline.org/fekulokipakamanufinoj.pdfIn PDF document text
    • https://cdn.sqhk.co/jalixuwefes/mYcM0Rm/android_room_hashmap_typeconverter.pdfIn PDF document text
    • https://cdn.sqhk.co/vumatoxikom/hf4qToW/beniwevirufujekajofujeko.pdfIn PDF document text
    • http://dfds.in/395709642191b7it.pdfIn PDF document text
    • http://nafarami.medianewsonline.com/78158489537.pdfIn PDF document text
    • https://cdn.sqhk.co/pozusonitid/qjbZaZ5/classic_halloween_movies_black_and_white.pdfIn PDF document text
    • https://cdn.sqhk.co/zifalulog/ajcghVh/snes_controller_nintendo_switch_canada.pdfIn PDF document text
    • https://cdn.sqhk.co/saboxiwago/jif5Wv0/new_guitar_love_ringtones_download.pdfIn PDF document text
    • http://sluzhba1.net/41164497879xgag.pdfIn PDF document text
    • http://luchdobro.site/vugotizelasizalegix098x6.pdfIn PDF document text
    • https://cdn.sqhk.co/tazuxalana/TTchbgc/super_farmer_online_game.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/44346186-1002-4838-b9a3-32ab22b849de/is_there_polar_bears_in_canada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f78a271e-b172-437e-bb61-39482c14882d/free_math_worksheets_for_college_students.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3122d25-daf8-444f-8a42-f3527a5ea618/zugawelapobunozesepemopog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d270db15-0daa-476e-ade3-34e3caef8e35/79741768917.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9dc526a3-3a17-4b61-a730-b75e4bc63761/what_are_the_different_genres_of_films.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_off000117fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117FE 5728 bytes
SHA-256: 37848fe06e2deace27e022bd403aa0c5b4108121e6bc68aebd7ce7ef38657b4c
font_01_sfnt_off00012b6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B6B 11688 bytes
SHA-256: 62601013875e4a0d84e0e3eed004434625abb80395e9537c76eeb35cbbae1cf0