Malicious PDF — malware analysis report

Static analysis result for SHA-256 c300c7888083297e…

MALICIOUS

PDF

78.5 KB Created: 2021-04-13 02:45:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 08066854ef1e5517abc448f26f94ab13 SHA-1: 54dbda8d8a33536c909a9ea36811d177dd91abc5 SHA-256: c300c7888083297e473f0460998fe2841aeeb4c92d26250820f3ecddf280a57d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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://kuzutuzo.ru/strik?utm_term=free+nancy+drew+games+online PDF link annotation
    • http://plsale.pro/65473305096jjokj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445320/normal_605dbe749f9ea.pdfIn PDF document text
    • http://mosemajubuj.22web.org/38193560547.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476939/normal_60066d62176c2.pdfIn PDF document text
    • http://yandex-delivery.cc/letazusadinadaneneditudk52zn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467032/normal_601cefd036525.pdfIn PDF document text
    • http://realwockyc.info/79263410864bca2.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/d63bc00f-d2a0-4bde-a31e-5d026181b392/cloud_security_alliance_csa_cloud_control_matrix_ccm.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c655c881-4829-4893-94b1-195a05e18d24/semanixijasefawadetubak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/074e4b04-2ec4-496f-825e-cc8f19a5e588/sivapuranam_in_tamil_mp3_song_download.pdfIn PDF document text
    • https://s3.amazonaws.com/sobaketemu/atheroma_formation_physiology.pdfIn PDF document text
    • https://s3.amazonaws.com/mosezavor/52262910673.pdfIn PDF document text
    • http://derabipolo.rf.gd/functional_behavior_assessment.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02be6796-6292-4b16-a6f3-2f339460a4a7/separasuvaf.pdfIn PDF document text
    • http://nuvujudidasutem.rf.gd/iceage_beyondless_album.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA44 5116 bytes
SHA-256: ca0375334171bac272be6eb6638b042fd139be0067cc3b191c010fc2299fce99
font_01_sfnt_off0000fb9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9A 10540 bytes
SHA-256: 70f1084ebdd9503aba629753eb96c5fa2766199d4fb6629e54156646a50d4075
font_02_sfnt_off00011f33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F33 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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