Malicious PDF — malware analysis report

Static analysis result for SHA-256 9787810d4f2653f4…

MALICIOUS

PDF

66.5 KB Created: 2021-03-23 14:32:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: e95b7c3ec5c8bd390ef7657a4d226d25 SHA-1: ece272ba820aa44d97cb8da2d370fbaff8c69abb SHA-256: 9787810d4f2653f40b41320afc115768716a82366eabae353e1c0a7edf666573
126 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm on disposable hosting, with a high ML score and ClamAV detection as a phishing trojan. The embedded URL points to a suspicious domain, likely intended to redirect the user to a malicious site. While no scripts were explicitly extracted, the PDF structure and URL usage suggest an attempt to deliver a payload or phish credentials.

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://druttle.ru/strik?utm_term=what+are+the+ten+main+components+of+a+report PDF link annotation
    • http://kulokozataxat.22web.org/ham_radio_test_questions_and_answers.pdfIn PDF document text
    • http://pewodebepefawi.scienceontheweb.net/leresedixawizejazigudu.pdfIn PDF document text
    • http://xujilutobidiko.iblogger.org/chopin_nocturne_op_9_1_sheet_music.pdfIn PDF document text
    • http://vowitufafuzebil.scienceontheweb.net/stand_by_me_lyrics_and_chords_piano.pdfIn PDF document text
    • http://vakafubetax.iblogger.org/dream_of_a_spider_in_my_hair.pdfIn PDF document text
    • https://cdn.sqhk.co/sifalavuxozo/oYAhahj/special_forces_group_2_apk_only.pdfIn PDF document text
    • https://cdn.sqhk.co/menidume/iibjhWP/atul_purohit_garba_pagalworld.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rupizilok.epizy.com/65001967534.pdfIn PDF document text
    • https://198d5876-2e36-4a54-a59d-b4c1060b65be.filesusr.com/ugd/4733ca_06509478517a446c9e5b473be95dd658.pdf?index=trueIn PDF document text
    • http://satanomoxa.rf.gd/baskin_robbins_job_application.pdfIn PDF document text
    • https://7ae774ad-b64d-4473-a0b1-aa0db1e39e83.filesusr.com/ugd/3e7897_23529139f20f440c859eee58105c2f85.pdf?index=trueIn PDF document text
    • http://wulifigib.epizy.com/wwe_2k16_gameplay.pdfIn PDF document text
    • http://zuzekawi.rf.gd/87967098604.pdfIn PDF document text
    • http://xivubijorudi.epizy.com/android_one_launcher_mod_apk.pdfIn PDF document text
    • https://aed022ca-8a9d-452d-9022-56a74a585a14.filesusr.com/ugd/4d548e_212e5921322e45608a21d4985c79e9e2.pdf?index=trueIn PDF document text
    • http://fizifar.epizy.com/brother_mfc-8710dw_printing_fuzzy.pdfIn PDF document text
    • https://36425c1f-c329-48aa-845d-1f8252cb45c8.filesusr.com/ugd/01d500_3806d4807b6045b9ae985ddca5374c73.pdf?index=trueIn 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_off0000c8b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B8 5236 bytes
SHA-256: 60d69ae9f853b94627c800839ffe96feacaebf2d40aff4a19299a3493a3d29f8
font_01_sfnt_off0000da6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6B 10012 bytes
SHA-256: 01ccba04e3c70425e7a95e40060c9fe43f659b5d63b245e59781f3db7a1e8327

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