Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f6018bda786ac85…

MALICIOUS

PDF

70.3 KB Created: 2021-02-17 07:54:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 933a278638bb60aad753a1d0d7b869f3 SHA-1: 735837cbdd60c4a11ccdbacec8cbf343786b2cab SHA-256: 9f6018bda786ac852c209b68d3a54dfecc2b82f2894fc81fbac37f843885a24f
134 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. The presence of multiple external URIs, including one on disposable hosting, and a heuristic for a 'download button' lure suggest an attempt to trick the user into navigating to a malicious site. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with common phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/strik?utm_term=pioneer+vsx+305+specs PDF link annotation
    • https://witojezig.weebly.com/uploads/1/3/0/7/130776148/762d9f4.pdfIn PDF document text
    • https://zobezefifoluza.weebly.com/uploads/1/3/5/3/135306737/d3932099fe6.pdfIn PDF document text
    • https://fubomagasikeka.weebly.com/uploads/1/3/4/4/134474343/1cd7af.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://dafiwogi.rf.gd/chalcedonian_creed.pdfIn PDF document text
    • https://s3.amazonaws.com/somamere/tazijezuzunarowebexomo.pdfIn PDF document text
    • http://vulebodifoguvar.epizy.com/23348645649.pdfIn PDF document text
    • http://favilogas.rf.gd/will_cyberpunk_2077_get_multiplayer.pdfIn PDF document text
    • http://timosawudub.rf.gd/wogukufaduvibasarutegub.pdfIn PDF document text
    • http://fewuzefar.rf.gd/3_manualidades_para_vender_o_regalar.pdfIn PDF document text
    • http://pogifovemujure.epizy.com/gegugajisajonurufokevude.pdfIn PDF document text
    • http://gepikadagutuv.epizy.com/adolescent_depression_screening.pdfIn PDF document text
    • https://s3.amazonaws.com/sigobija/37794076858.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_off0000c5c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5C0 4952 bytes
SHA-256: de53cb0bc1f39fe72ae8689daf057acfe6ffd3d621eb28ce6f00a7e11fe22976
font_01_sfnt_off0000d696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD696 12528 bytes
SHA-256: 8e7259cf3cbb26a6a76829c68b60e70ad789cd88ccd11b7d37a05321ee4da8f1
font_02_sfnt_off0000fec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC8 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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