Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd3fa5c8f9c79b2b…

MALICIOUS

PDF

82.5 KB Created: 2021-04-27 23:01:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a7d791ed3ff97a7b618f805b9fc8dffc SHA-1: a19b875f051d0f597eb191740dea6e4701ee6892 SHA-256: fd3fa5c8f9c79b2bcb6c63448298dc4b26228fd938a342cf3febd7fabbe7593e
126 Risk Score

Malware Insights

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

The file is a PDF that contains obfuscated text and multiple embedded URLs, with a high ML classifier score and ClamAV detection indicating malicious intent. One of the primary URLs, 'https://xajibur.ru/strik?utm_term=db2+sql+error+sqlcode%253D-104+sqlstate%253D42601+sqlerrmc%253Das', appears to be a lure related to a database error, suggesting a phishing or malware distribution attempt. The PDF also hosts a link farm on disposable domains, further indicating malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xajibur.ru/strik?utm_term=db2+sql+error+sqlcode%253D-104+sqlstate%253D42601+sqlerrmc%253Das PDF link annotation
    • http://nozatisesufi.scienceontheweb.net/topugiretaforu.pdfIn PDF document text
    • http://rusewigojubilon.mygamesonline.org/xopobewasifojujim.pdfIn PDF document text
    • http://moxupasasitote.mywebcommunity.org/jadotigapulesaroneraraze.pdfIn PDF document text
    • http://vetovikaxu.mypressonline.com/regime_de_capitalizao_composta.pdfIn PDF document text
    • http://gexopidikimo.mygamesonline.org/12718537578.pdfIn PDF document text
    • http://jepenufi.getenjoyment.net/65353238383.pdfIn PDF document text
    • http://vogolimipogusoz.mypressonline.com/xuzoseriduzeturej.pdfIn PDF document text
    • http://tideboweped.medianewsonline.com/was_were_wasn_t_weren_t_exercises.pdfIn PDF document text
    • http://saduzemed.mypressonline.com/vekifu.pdfIn PDF document text
    • http://medebupima.sportsontheweb.net/wotaxawedixa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/luropiw/dubodi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7309b495-09de-46bf-8ca5-eda6f260b0bf/sumevebelenisosovuxiwofu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fed5862d-63fe-456d-8c10-c44feda5b8ac/vba_programming_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/gofiguj/42914903366.pdfIn PDF document text
    • http://dapizodipe.myartsonline.com/la_la_land_ending_scene_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7eca2023-16e8-4452-a464-554914dd0b90/17497029298.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12414a05-be8f-4a80-ad8b-525ff6c3816e/xozakupaduwaderuxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bd56113-1c9f-4680-acaf-3ab7a093ba4a/how_to_connect_dell_wireless_mouse_to_laptop_without_usb_receiver.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80962c26-4ca6-4780-b116-77b8c6daeccb/why_do_covalent_molecules_have_low_melting_points.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_off000101de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DE 5996 bytes
SHA-256: 09f2eee5aa140fa0e1070ec62a19b80181688ab0ec9c397c2edee5526a41a31d
font_01_sfnt_off0001163d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163D 11224 bytes
SHA-256: 65ff19a56e2e8d694a655b2cfe7d220cb4d49441e6e53e516ba9295cf4242fb1

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