Malicious PDF — malware analysis report

Static analysis result for SHA-256 d42b78bbf13c5414…

MALICIOUS

PDF

78.6 KB Created: 2021-03-12 01:42:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 6f628eae6589e4289fb096c28a0ad450 SHA-1: b3316f4f9a9e23ff6ba323c696c970a3cbc7baa9 SHA-256: d42b78bbf13c5414f589992c135a27babe00cb48d9c5f4aeec5a00ea466f77b0
126 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, appears to be a lure related to setting up a coffee pot, masking the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://zajinet.ru/aws?utm_term=how+to+set+a+farberware+coffee+pot PDF link annotation
    • http://zajilakofudo.scienceontheweb.net/network_interface_card_diagram.pdfIn PDF document text
    • http://modezewop.mygamesonline.org/islamic_baby_girl_name_with_bangla_meaning.pdfIn PDF document text
    • http://pawezujexas.mywebcommunity.org/pacific_cycle_schwinn_trailblazer_double_bicycle_trailer.pdfIn PDF document text
    • https://cdn.sqhk.co/fitamorigob/ulhar5R/dedomexapasoxuvurituvow.pdfIn PDF document text
    • http://soinjaga.ru/rise_of_kingdoms_commander_guide_baibarsa4lgr.pdfIn PDF document text
    • https://cdn.sqhk.co/fubemabofof/igE39ja/nail_designs_2020_ombre.pdfIn PDF document text
    • http://dugarudewemudo.sportsontheweb.net/molarabegexefuzumiralu.pdfIn PDF document text
    • http://update-win20.online/fatufovozitase46tu.pdfIn PDF document text
    • https://cdn.sqhk.co/rewufarelaze/YMUECp2/falling_balls_sound_effect.pdfIn PDF document text
    • http://remontlegko.info/gapupurek0lya.pdfIn PDF document text
    • http://dakisemakegag.sportsontheweb.net/77345499898.pdfIn PDF document text
    • http://prizinsta24.space/pidivaruguzepl4m.pdfIn PDF document text
    • http://pokezokebawi.mygamesonline.org/reduduzopip.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nevabaza.atwebpages.com/32423472731.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ae3f160-c150-4c1a-8bed-d83cd296693e/how_to_connect_echo_dot_2nd_gen_to_wifi.pdfIn PDF document text
    • http://farovosodiwes.atwebpages.com/knee_joint_exercise.pdfIn PDF document text
    • https://s3.amazonaws.com/pazatuv/apply_consolidated_marksheet_madras_university_online.pdfIn PDF document text
    • https://s3.amazonaws.com/dejolavubukugeb/24908368921.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9881aa25-b756-4ecb-84ff-eace7c118d14/65004890402.pdfIn PDF document text
    • https://s3.amazonaws.com/jazamerijekufol/xitamonupobirujotowulatut.pdfIn PDF document text
    • https://s3.amazonaws.com/supefujoxopubu/40921160479.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f08a8937-ff0d-46b0-b953-bba360418673/what_literary_devices_are_used_in_the_poem.pdfIn PDF document text
    • https://s3.amazonaws.com/xasovewipeje/zazazidorav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8eed435b-d3eb-4ad7-91ca-1d2bd61580ac/dawolimijatu.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_off0000f8cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CF 5172 bytes
SHA-256: e854fc836521a71d99d394162ff9160a8aba7c939f4fb6eeb8848ceda80f1130
font_01_sfnt_off00010a85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A85 10052 bytes
SHA-256: 10a5fe4eba1cb5a2b8fe4a40257868c85f8b70d0c41744e2ae1117e9e0491063

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