Malicious PDF — malware analysis report

Static analysis result for SHA-256 31d47f704b3c929e…

MALICIOUS

PDF

79.3 KB Created: 2021-04-10 18:17:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 52a68ec3c1b32fbc5f09a5b126dae8dc SHA-1: e750a273e946fba9b982883a1b53ed83fc3426d1 SHA-256: 31d47f704b3c929ea620f95e84b382c89d1c4a78b4dd721aca74eba16b154a88
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by heuristics as a link farm and a phishing/malicious PDF. The document body, though heavily obfuscated, suggests a lure related to resetting a TP-Link device, which is a common pretext for phishing. The presence of external URIs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful 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://lozipotod.ru/strik?utm_term=cara+reset+tp+link+tl-wr840n PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4476294/normal_600bbe56ed7db.pdfIn PDF document text
    • http://ig-mediateam.net/xupixuruwabuahdv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447912/normal_6023d51529293.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387711/normal_6017555a882eb.pdfIn PDF document text
    • https://cdn.sqhk.co/lawafopugu/3jigj5E/nuclear_strike_bomber_hack.pdfIn PDF document text
    • https://cdn.sqhk.co/joziroluxu/2darhea/diphenhydramine_davis_drug_guide.pdfIn PDF document text
    • http://potusowo.22web.org/case_files_family_medicine_5th_edition.pdfIn PDF document text
    • http://jagefefixod.22web.org/singular_and_plural_nouns_worksheets_first_grade.pdfIn PDF document text
    • http://roralukomoko.22web.org/rivobepidolofijuduvadax.pdfIn PDF document text
    • http://mmuuue.space/dialux_trainingqay1x.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://55d63786-14d6-44de-84d0-33f1fb383c44.filesusr.com/ugd/45fd81_aae7ee0aa5af4069b83d664b6087707a.pdf?index=trueIn PDF document text
    • https://51bf459c-6b46-41b0-863f-532cf8a77e0d.filesusr.com/ugd/2eedf1_f6a15bb5a5ce4176a8079dc2c06760cb.pdf?index=trueIn PDF document text
    • https://777dd155-384c-4f1d-a337-8f27b94bb056.filesusr.com/ugd/1ecdae_8146646a60d34a5badf5cae18a3e5a30.pdf?index=trueIn PDF document text
    • https://9e1e9198-0fe7-4103-8084-fdcc6befb8d5.filesusr.com/ugd/2f7815_cbf5025f48054fc3b700e7ae29706c22.pdf?index=trueIn PDF document text
    • http://laxaguwen.epizy.com/apache_nifi_1._7._0.pdfIn PDF document text
    • https://2e4d99de-9d37-4ce2-abd5-0bbccafdbe51.filesusr.com/ugd/33a2e4_e6662945bdab4cd38b6b238bb5e37307.pdf?index=trueIn PDF document text
    • http://xubomegixabax.epizy.com/pabese.pdfIn PDF document text
    • http://nukamepewavux.epizy.com/jobavoripugumufafukuna.pdfIn PDF document text
    • http://ganuxujerotapu.epizy.com/cebuana_pera_padala_form.pdfIn PDF document text
    • http://bonizigajivoxi.epizy.com/28928893986.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_off0000f498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF498 5332 bytes
SHA-256: 93f91cce254b2a74890759117d46f6263605632266cbf4a1b54d92c5353590f9
font_01_sfnt_off000106e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E6 11516 bytes
SHA-256: cc3d964cedf8d10def55c8ccdde345e118a188eb698c415468f5c172d2035a10

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