Malicious PDF — malware analysis report

Static analysis result for SHA-256 908b03ab3c5cd788…

MALICIOUS

PDF

66.7 KB Created: 2021-02-08 13:55:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 285df72ac478c1a5d80300f6f72fd828 SHA-1: 6f8dd7c6a2312bd6c8f91ac5d25cf88ad0d4d8cf SHA-256: 908b03ab3c5cd7885ece3fe99d3791b50f6876e6c152a4a50e78538354574168
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are hosted on disposable domains or link farms, indicating a potential SEO spam or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jacksth.ru/aws?utm_term=philips+aquatouch+at899+manual PDF link annotation
    • https://zilexewutefak.weebly.com/uploads/1/3/4/6/134608169/1af212a4b0.pdfIn PDF document text
    • https://cdn.sqhk.co/vemetafije/cigiage/xumepu.pdfIn PDF document text
    • https://nodepuje.weebly.com/uploads/1/3/4/5/134518199/bc3bd98c71985b9.pdfIn PDF document text
    • https://cdn.sqhk.co/jipogidara/jjdhieK/prank_call_voices_to_use_scary.pdfIn PDF document text
    • https://cdn.sqhk.co/tuledapozato/hhdkghG/the_flower_mound_careers.pdfIn PDF document text
    • https://sekorora.weebly.com/uploads/1/3/4/8/134856449/4014749.pdfIn PDF document text
    • https://cdn.sqhk.co/naliwanik/hihjhec/rujazulemakawosutepebo.pdfIn PDF document text
    • http://soxexuv.iblogger.org/78019429879.pdfIn PDF document text
    • https://fidinavaxevipew.weebly.com/uploads/1/3/4/8/134876378/bibapow-genawi-xonipedinar.pdfIn PDF document text
    • https://cdn.sqhk.co/lanamixese/ZFXtyas/stack_colors_mod_apk_download.pdfIn PDF document text
    • https://xipurewaxo.weebly.com/uploads/1/3/4/7/134759043/85a0da4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xugivazule.rf.gd/hal_foster_the_anti_aesthetic.pdfIn PDF document text
    • http://tomenederixi.epizy.com/sutatalexatabafaw.pdfIn PDF document text
    • http://givonomiruf.rf.gd/bait_3d_full_movie.pdfIn PDF document text
    • http://xilibosukotijob.epizy.com/ms_sql_server_2008_express_edition.pdfIn PDF document text
    • http://mefirakuk.epizy.com/odia_movie_hd_video_song.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_off0000c712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC712 5556 bytes
SHA-256: b8ec1d63bdd36c4db46a3be9f0edf4868d9cac0dd4d7ba18672af4ba4b2c65d8
font_01_sfnt_off0000d9d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D6 10620 bytes
SHA-256: 3bfe60fd4074950246047ef6c99e242475cc1434f8bbd7c400d52924af95b4c7

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