Malicious PDF — malware analysis report

Static analysis result for SHA-256 15ca7653d99608f2…

MALICIOUS

PDF

98.4 KB Created: 2021-02-14 17:36:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0fb3db59bc436e2523d557895ca59c52 SHA-1: b01b4c8b7942bd54ba9d85675114516ffb841609 SHA-256: 15ca7653d99608f219a7147ec0f828e2fa9981ac997f556f40b694203db2656c
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, many pointing to disposable domains, and exhibits characteristics of a link farm. The presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect users to malicious sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://seumenha.ru/aws?utm_term=affine+transformation+matrix+inverse PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4372371/normal_5fd0ee93b4c0d.pdfIn PDF document text
    • http://omynutural.space/multi_step_registration_form_template_bootstrap0ud3d.pdfIn PDF document text
    • http://bionatur.space/search_by_image_from_android_phoneyc7nz.pdfIn PDF document text
    • https://wafodalepida.weebly.com/uploads/1/3/1/8/131871454/riludipatoj.pdfIn PDF document text
    • http://good-production20.site/935337732969bzyw.pdfIn PDF document text
    • https://menuzuxa.weebly.com/uploads/1/3/1/0/131070619/mopevirexuwo.pdfIn PDF document text
    • http://kezivinu.iblogger.org/tatulafinulonawewapuno.pdfIn PDF document text
    • http://creditscorecard.info/bsc_full_form_in_business83eje.pdfIn PDF document text
    • https://vepovipozo.weebly.com/uploads/1/3/4/4/134472033/zipimafagudimufated.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bogasupi.rf.gd/kufexedelesegafeko.pdfIn PDF document text
    • http://jatujij.rf.gd/reportage_attentat_nice_replay.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12805 4996 bytes
SHA-256: 843e5df41efa24286692a59ab1cd60d9afd79ba1a5eb7d29a32b69547d0ee4fe
font_01_sfnt_off000138f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138F6 13428 bytes
SHA-256: 509c307901b060deb3d23bc262184329f9a769546672cfc97b874e9ff01c902d
font_02_sfnt_off000165ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165EE 16544 bytes
SHA-256: 6a0b4d9e4ba14ca6c6adf91eb70fbbf01a7cd071c0e09d581e4c05b47c96cd43

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