Malicious PDF — malware analysis report

Static analysis result for SHA-256 f23095c57aea4b8f…

MALICIOUS

PDF

69.5 KB Created: 2021-02-25 00:59:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 62b19ffeea16781ff229c23421591c6e SHA-1: e6587fc95bdf2ffced77272af7297a5db0a2d6a2 SHA-256: f23095c57aea4b8f56277956166829bbe9bf018405ee72374c2d75d7287882c6
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are used in a link farm, suggesting an attempt to redirect users to malicious content. The document body, though heavily obfuscated, contains references to 'Toshiba laptop touchpad driver update', indicating a social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/123?utm_term=toshiba+laptop+touchpad+driver+update PDF link annotation
    • http://lunatan.medianewsonline.com/depodibefosegararikuto.pdfIn PDF document text
    • https://lewezuwarekizes.weebly.com/uploads/1/3/4/0/134040914/rirezixor.pdfIn PDF document text
    • http://tinuliv.22web.org/xemaxebafojigedanim.pdfIn PDF document text
    • http://peromopativej.mypressonline.com/fibomerutafasodafujigirid.pdfIn PDF document text
    • https://zizuvikugit.weebly.com/uploads/1/3/1/3/131384696/9726718.pdfIn PDF document text
    • https://vezerovir.weebly.com/uploads/1/3/4/5/134580053/2904765.pdfIn PDF document text
    • https://dunewalowipeli.weebly.com/uploads/1/3/1/8/131856746/2206689.pdfIn PDF document text
    • https://wasatetokis.weebly.com/uploads/1/3/4/5/134513062/dovisopuvixope.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lolaritemukole/52661193503.pdfIn PDF document text
    • https://s3.amazonaws.com/jidagafinuxesu/united_healthcare_prior_authorization_form_for_radiology.pdfIn PDF document text
    • http://kedisijusa.onlinewebshop.net/less_than_zero_full_movie_123.pdfIn PDF document text
    • http://nojikigor.myartsonline.com/the_wanderers_where_are_they_now.pdfIn PDF document text
    • http://jogered.rf.gd/27070098061.pdfIn PDF document text
    • https://s3.amazonaws.com/nimuwet/57478989648.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_off0000d25d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD25D 5312 bytes
SHA-256: 19b983c26ff96e5b072fe8ac4893aca5ee5d111a610cd92ec8d97263ef1de7c1
font_01_sfnt_off0000e45d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45D 10904 bytes
SHA-256: beec8b6db74877f310a2e1671668fcceacd1f333275e201601c202e33e9bd224

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