Malicious PDF — malware analysis report

Static analysis result for SHA-256 d30c50e93db9af37…

MALICIOUS

PDF

75.3 KB Created: 2021-02-21 16:26:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 66cd97e87009eba3415a12fe0b49ce9a SHA-1: ab72eb21998547fe0be74dba75c96ee183d2e0e3 SHA-256: d30c50e93db9af37f8fe97bac45c4cbe0fbdbb7c729f8091fe3cdf751403ca13
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Numerous embedded URLs were found, many pointing to disposable domains and employing UTM parameters, indicating a link farm designed to redirect users to potentially malicious content. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDF documents from web content.

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://leonvi.ru/strik?utm_term=how+to+turn+off+dvr+on+dish PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4467955/normal_601ad30a4f59d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413865/normal_60305a8a51b4c.pdfIn PDF document text
    • https://giweberemep.weebly.com/uploads/1/3/2/6/132682555/rejuzevuvixej-digubuz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411219/normal_5fdb71f70b789.pdfIn PDF document text
    • https://fojujagijis.weebly.com/uploads/1/3/4/4/134463082/miniro-tudarizule.pdfIn PDF document text
    • https://jokokosewel.weebly.com/uploads/1/3/1/4/131437237/gepibiranelu.pdfIn PDF document text
    • https://sozatoma.weebly.com/uploads/1/3/4/4/134484551/zekegonuwuta_riwumoka.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426423/normal_5ff7cc2d01372.pdfIn PDF document text
    • https://cdn.sqhk.co/wesebewoweva/i6gehiH/fupewogula.pdfIn PDF document text
    • http://kewugujijafe.iblogger.org/50087003373.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bebidexaroz.rf.gd/disney_cast_member_discounts_2018.pdfIn PDF document text
    • http://kidoputuf.epizy.com/opera_browser_android_add_ons.pdfIn PDF document text
    • http://zunabaxuwisi.rf.gd/55037903844.pdfIn PDF document text
    • http://womepulus.epizy.com/evenflo_symphony_dlx_all-in-one_car_seat_review.pdfIn PDF document text
    • https://s3.amazonaws.com/punagilelabon/boost_audio_sound_android.pdfIn PDF document text
    • https://s3.amazonaws.com/lijopavexanuse/mystery_of_love_sufjan_stevens_sheet_music.pdfIn PDF document text
    • http://finesegugumemo.epizy.com/emulateur_android_sur_pc_nox.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_off0000ea5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5F 4864 bytes
SHA-256: fcc3c6fb07ee491103727f779b0c23ace3d29846f9fb575956e4d6b36696926e
font_01_sfnt_off0000fafe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFE 10972 bytes
SHA-256: c994fd3410b4af603dc5a8234551cb56e391c4d0177d7e64e82b1be13a02a0f7

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