Malicious PDF — malware analysis report

Static analysis result for SHA-256 f059a518fea5add5…

MALICIOUS

PDF

78.2 KB Created: 2021-04-03 14:21:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 21a68f2c00fce56862439b9d9936b301 SHA-1: 8fb59afac3472411d9af644caca0d21187ba14a0 SHA-256: f059a518fea5add5e0b7266ac63a726a4512f30d99f88414c89643034a3ca5ca
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. One of the primary URLs extracted is `https://resalured.ru/strik?utm_term=how+to+fix+unbalanced+lg+washer`, which is likely part of a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://resalured.ru/strik?utm_term=how+to+fix+unbalanced+lg+washer PDF link annotation
    • https://vugosolisaxude.weebly.com/uploads/1/3/2/8/132814967/1769afa1162007.pdfIn PDF document text
    • https://cdn.sqhk.co/vefapatape/gfoc0gc/car_driving_game_download_for_windows_7.pdfIn PDF document text
    • https://cdn.sqhk.co/devepogisog/hbiirgg/nuvixawabegezuv.pdfIn PDF document text
    • https://cdn.sqhk.co/xadowififux/if9icjf/black_desert_mobile_valkyrie_guide.pdfIn PDF document text
    • http://vuliduku.22web.org/jack_and_the_beanstalk_free.pdfIn PDF document text
    • http://setokanekema.mygamesonline.org/edit_file_software_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/sevijeruba/heieglP/11077716764.pdfIn PDF document text
    • http://xijonofupawulo.mypressonline.com/july_calendar_2020_printable.pdfIn PDF document text
    • https://cdn.sqhk.co/nizufalagef/cgckz5k/2275132597.pdfIn PDF document text
    • https://fadoxidibeja.weebly.com/uploads/1/3/2/6/132695582/2799581.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f01420c-2c7e-4969-a5d7-0ac8f576870f/mind_power_john_kehoe_free_download.pdfIn PDF document text
    • https://770ad53b-b55e-4e58-b1eb-3709f41304f7.filesusr.com/ugd/98e298_1a9dec7fc10a45adbc373491ef8415ed.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcd785a3-9f35-403c-ba3d-50f24402298f/35542905482.pdfIn PDF document text
    • https://e4da1597-3bb3-488b-9226-7c2c9e06e9ce.filesusr.com/ugd/db5d73_92818fa3ae424eaca0e542245d3d58f7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ceabc92c-14c5-45b4-88dd-c99b26f6783d/teneru.pdfIn PDF document text
    • http://sakonolib.rf.gd/3905956184.pdfIn PDF document text
    • http://jimavuzeladones.epizy.com/armorer_level_guide_ffxiv.pdfIn PDF document text
    • https://6d4cd3b7-91e9-43ac-92b9-205473f1e50d.filesusr.com/ugd/28146e_7daf56ed6be048438664000af1353c43.pdf?index=trueIn PDF document text
    • http://wepirizifomonij.epizy.com/71490732281.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_off0000f2f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F0 5544 bytes
SHA-256: 58fc4302003aa1f141705ca9902a292f1d890310da7d86af5fac6ac2c2943a70
font_01_sfnt_off000105db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DB 10932 bytes
SHA-256: f58263ce9238ceb98ca4ecbc6d18c006949f87b46f5e87a9d30ec7f06e3fdcd4

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