Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1341a13af1984d8…

MALICIOUS

PDF

70.3 KB Created: 2021-02-11 04:21:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 74bc9a8f4132aa9e9181c7cb1fd3324e SHA-1: 241e05e6ede39ea6a2106700b447aa1cbef906e0 SHA-256: b1341a13af1984d88abf7cd60cdb07469a7741c0cd4f126a3331ec713c1a4fc4
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one prominent URL pointing to a domain associated with phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the PDF is designed to host many links, further supporting a malicious purpose. Although no scripts were explicitly extracted, the presence of embedded URLs and the overall detection suggest it acts as a downloader or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/123?utm_term=ski+doo+service+manual PDF link annotation
    • http://f13x.xyz/bird_song_identification_app_android_freefvqq6.pdfIn PDF document text
    • http://interbank.link/afghan_jalebi_song_djjohalgidwt.pdfIn PDF document text
    • https://tulalesin.weebly.com/uploads/1/3/4/8/134876190/4814589.pdfIn PDF document text
    • https://fatomomome.weebly.com/uploads/1/3/1/6/131606630/buvikozibif.pdfIn PDF document text
    • http://richmaya.site/jupigonejipoboterosoreturcknz.pdfIn PDF document text
    • https://magenudelekoj.weebly.com/uploads/1/3/5/9/135975171/xutumamo-vufexer-wirisigurajez-kurad.pdfIn PDF document text
    • https://tufuziboserivu.weebly.com/uploads/1/3/1/6/131636644/gobadasoxu-kokedigalulufun.pdfIn PDF document text
    • http://help-lnstagram-verifycopyrgiht.com/81139361200cuukx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://nemunuj.rf.gd/92701434611.pdfIn PDF document text
    • http://wepirizifomonij.epizy.com/71490732281.pdfIn PDF document text
    • http://papewemejivore.rf.gd/11963366816.pdfIn PDF document text
    • http://fewufewidi.epizy.com/47418028509.pdfIn PDF document text
    • https://s3.amazonaws.com/mizeteb/rockstar_games_mobile.pdfIn PDF document text
    • http://lodemeralakutox.epizy.com/67765209102.pdfIn PDF document text
    • http://paporoj.rf.gd/best_tablet_for_reading_2018.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC24 5112 bytes
SHA-256: 3cf411ac0097842ee170286bc86ac4973f8a7d43fbb59558f7cc23372f257b74
font_01_sfnt_off0000dd5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5D 9672 bytes
SHA-256: 073a2e0296c10a4b2a02ce1ed8d5fb69fba5a9bae52683d6579269a4aea8d630
font_02_sfnt_off0000fe74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE74 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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