Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8efa5e85926d880…

MALICIOUS

PDF

73.3 KB Created: 2021-02-24 03:56:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 062b4ef8924f97bdb9ec972c7765ffd4 SHA-1: 14a128886ecf350796e4728d37f30b0cf7334d93 SHA-256: f8efa5e85926d880cb2446a43db6b112ef56091729fe435f46d650e6a78620ed
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one identified as a malicious redirector. The document body, though heavily obfuscated, suggests a lure related to photography composition. The presence of multiple disposable hosting links and a critical heuristic firing for malicious redirector links strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/aws?utm_term=how+to+get+good+composition+in+photography In PDF document text
    • https://cdn.sqhk.co/jebavimot/HwjjNjd/community_woodshop_brooklyn.pdfIn PDF document text
    • https://cdn.sqhk.co/janawezexoj/bgdijhb/final_freeway_mod_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426407/normal_5fcd5dc4a7269.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501206/normal_60243c9d91564.pdfIn PDF document text
    • http://jipujitematane.iblogger.org/54428231685.pdfIn PDF document text
    • https://cdn.sqhk.co/foropogajag/dWiiGhc/screen_off_video_recorder_pro_apk.pdfIn PDF document text
    • http://keepxufi.space/piguzatasokevifux6mc16.pdfIn PDF document text
    • http://karaulovlife.site/nitijoluxobixuxrqnrl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474169/normal_5fee370e12fba.pdfIn PDF document text
    • http://detonicro.website/ccna_security_study_guidemgjm7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416143/normal_6027d6eace0c2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390381/normal_6008c1f9e2353.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495409/normal_5fd904c89d8e4.pdfIn PDF document text
    • https://cdn.sqhk.co/moxibusas/MxheQgc/werilasanekorola.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jefevuxivux.epizy.com/64492060855.pdfIn PDF document text
    • http://gedaseda.rf.gd/product_brochure_template_photoshop.pdfIn PDF document text
    • http://pamakejexo.epizy.com/99334715176.pdfIn PDF document text
    • http://vugikalijuboxo.epizy.com/61906224609.pdfIn PDF document text
    • http://voxotili.epizy.com/wugusijaze.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_off0000e1eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EB 5608 bytes
SHA-256: 6b0ad569da55a2895fbe538535eb9113ac662a4e48cbf67719ce39f82287495d
font_01_sfnt_off0000f4ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EE 10168 bytes
SHA-256: 748ccf68295a06d4264d66277108db966701c4d075db51bcaf63e5bb8d523d8e

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