Malicious PDF — malware analysis report

Static analysis result for SHA-256 22a0c71e0a44406b…

MALICIOUS

PDF

77.4 KB Created: 2021-04-20 18:49:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 82ea728260d11d35a5bb852d6d9f52ee SHA-1: 102253577f95682f823b9198eb249867cb2c27a8 SHA-256: 22a0c71e0a44406bf1817e51599492a1bcebc7e494c75451aa1d99ca2e7d92aa
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-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://jacksth.ru/strik?utm_term=black+and+decker+7515+jigsaw+parts PDF link annotation
    • https://cdn.sqhk.co/kutajanode/jI2gjhi/32336158405.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413363/normal_601977e9f3441.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417306/normal_601b1ceec86aa.pdfIn PDF document text
    • https://cdn.sqhk.co/xuwadezab/LVAGgdJ/major_european_battles_of_wwii.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370063/normal_5fd37b76bc4af.pdfIn PDF document text
    • https://cdn.sqhk.co/xovikojux/f1gji3D/58044612654.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448328/normal_5ff1675f91601.pdfIn PDF document text
    • http://vizilirudigub.getenjoyment.net/ccna_arabic.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tarepos.onlinewebshop.net/electronics_engineering_book_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcf942ef-2dd9-4edb-a489-426eab383eb8/are_green_smoothies_good_for_pregnancy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/225d41b5-3927-40ba-b84b-752591cc205d/formula_to_calculate_half_life_of_radioactive_element.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cba0515-1667-48c3-8401-42917fd5ecba/red_cross_lifeguard_recertification.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20799b97-bd8d-4be4-a49e-35cc91eba97e/fosulatiwopubafapujex.pdfIn PDF document text
    • http://sifebitufol.onlinewebshop.net/penigobuderozegofa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d414a445-e505-4019-8590-9170dfa756cb/falcon_4.0_bms_4.32_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd450af0-674b-42c9-8986-77fdf1c9d414/tuwakidezaxibu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea224397-d534-4961-b78a-c28fef5de0b1/90871014187.pdfIn PDF document text
    • http://zutaturusix.myartsonline.com/barunabewezuxo.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_off0000ee1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1D 5780 bytes
SHA-256: 80b87fb402813be1e52c66479517dd23b55f41be875337958b31deee4b3916b2
font_01_sfnt_off00010206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10206 11392 bytes
SHA-256: 1eee2bb9ef6f06f97d1d609b0268adfa507f6875df203eb75f768f14809a2086

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