Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4aa9e31677903a3…

MALICIOUS

PDF

76.0 KB Created: 2021-03-16 19:25:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 047df437dd1d287b84f5107d1b56cf9b SHA-1: dfc5ba9a29684882534f3ab0c5bdd01001f0855e SHA-256: b4aa9e31677903a3ac318bdc1c90cd58ae284c97b38748a52d85c6982a3f0ae9
126 Risk Score

Malware Insights

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

The PDF file contains a lure for 'earn from home typing jobs' and embeds a URL pointing to 'lozipotod.ru'. This URL is associated with a link farm and disposable hosting, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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=earn+from+home+typing+jobs PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4418381/normal_601f732445a44.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484806/normal_5fe9fb87d1bd1.pdfIn PDF document text
    • http://gelchlen.fun/71229805630rzkgn.pdfIn PDF document text
    • http://akmurzina.com/forty_rules_of_love_summary_in_urduashyh.pdfIn PDF document text
    • http://memisada.mygamesonline.org/1709999022.pdfIn PDF document text
    • https://cdn.sqhk.co/badalozebale/cjafja4/puzzle_100_doors_room_escape_level_24.pdfIn PDF document text
    • https://cdn.sqhk.co/biloriput/HjiWgJ5/best_outdoor_survival_shows_on_netflix.pdfIn PDF document text
    • http://nasufulorejuwe.mywebcommunity.org/77290290863.pdfIn PDF document text
    • https://cdn.sqhk.co/rivotoxupow/hdhbzif/the_diplomat_magazine_wiki.pdfIn PDF document text
    • http://alkim.xyz/fejopugeduganoliyzx16.pdfIn PDF document text
    • https://cdn.sqhk.co/womilepeba/sZgeLY7/stream_alerts_sounds.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487194/normal_6006d9f11fd11.pdfIn PDF document text
    • http://slamelina.website/whatsapp_for_nokia_e72_freexokid.pdfIn PDF document text
    • http://nikecortez.net/navy_sapr_training_requirementsmg8pr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413016/normal_5ff91cfd2124a.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/457c0a89-c5fc-486f-a391-7adbfc650963/12040520180.pdfIn PDF document text
    • https://aabf49e0-5477-4fd2-8456-a986ef8f2a87.filesusr.com/ugd/9e14ca_f14d35be257c4a218ab2b2f2c059017b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e787240e-78a3-4ac5-a965-e2cd06acf9bb/heidelberg_catechism_commentary.pdfIn PDF document text
    • http://fetekovabu.onlinewebshop.net/how_to_measure_pr_campaign_success.pdfIn PDF document text
    • https://cd29ef07-728f-4a0b-b57b-23e770395c36.filesusr.com/ugd/f14cf6_7ddc81095f1a42f9a36cd4da522ed6b4.pdf?index=trueIn PDF document text
    • http://vujuvisesakok.myartsonline.com/83817082988.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_off0000e9e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E8 5556 bytes
SHA-256: a5f314838d23b851b58907481ed7392b1f0fcc6f6122cb9f33f54af78fa4eca2
font_01_sfnt_off0000fcbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBC 11176 bytes
SHA-256: 8802e60b8b2735e872dbbfc4132876d0dd3480b87cd65c27b46ddfa361066a7f

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