Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b281766237aa6e6…

MALICIOUS

PDF

77.4 KB Created: 2021-03-20 11:23:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 181b1dd22bb17ecadc01136018f2e102 SHA-1: 5832749cde598b3428626f3e9e7ae9d78212656c SHA-256: 7b281766237aa6e6644094aa591d17ba40175250e3a98595c3130316c891b063
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 0.9995

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://druttle.ru/123?utm_term=clinical+trial+informed+consent+template PDF link annotation
    • http://bikelumonekodex.mygamesonline.org/norago.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380700/normal_5fd77ba27c7e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456712/normal_6023371cf0a53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426270/normal_601869469ee05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450634/normal_601531c7d027d.pdfIn PDF document text
    • https://cdn.sqhk.co/dugelabomaw/eniharn/lenovo_band_companion.pdfIn PDF document text
    • http://mawosatejojeka.sportsontheweb.net/zifanaxefaporonutuvopiw.pdfIn PDF document text
    • https://cdn.sqhk.co/sijiposago/jimM7NM/xiruwegiwakew.pdfIn PDF document text
    • http://vimobewawulipiz.mypressonline.com/how_to_buy_shares_in_the_stock_market_for_beginners.pdfIn PDF document text
    • http://saripituxupagek.sportsontheweb.net/10th_science_book_english_medium_in_volume_2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://refusunono.onlinewebshop.net/57688115567.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2136d7ff-1134-4dd1-bd29-908b9c8497fc/69984777066.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78e46f7d-fb62-40cf-88ab-b75917482936/donisud.pdfIn PDF document text
    • http://tevefetilojas.atwebpages.com/organizational_behavior_1_essential_theories_of_motivation_and_leadership.pdfIn PDF document text
    • https://5e446c31-fcb6-4427-a178-91ee45bbff8b.filesusr.com/ugd/4e76b8_3e2fac3d2a7841b2a8bbe913b3bf18f9.pdf?index=trueIn PDF document text
    • http://zubiluwetij.myartsonline.com/36901747557.pdfIn PDF document text
    • http://sabiwilurase.atwebpages.com/62538594754.pdfIn PDF document text
    • https://bf6af823-cb0d-4ee8-9d5b-4f0b1de5ed24.filesusr.com/ugd/9eb187_9a19a010cec14fcea1e59703b0490ae5.pdf?index=trueIn PDF document text
    • http://litorow.myartsonline.com/possessive_pronouns_exercise.pdfIn PDF document text
    • https://76a725e8-946c-4ae9-9249-cda469d35108.filesusr.com/ugd/83c8cc_53ea2106910c4f07b18402d0ffd23516.pdf?index=trueIn PDF document text
    • http://nakixaxev.myartsonline.com/body_dysmorphic_disorder.pdfIn PDF document text
    • https://510adc33-753b-44c0-977e-8d34da8fcdd4.filesusr.com/ugd/5f4192_361554ba502a43aea6e309a0866aa6a2.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f25c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25C 5208 bytes
SHA-256: 3ed0fe24904de79103722a85b6e0a07baa7409af80f94b3083f77fe6b75ad740
font_01_sfnt_off000103f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F9 10540 bytes
SHA-256: 162dcbf43fe241f545b3eb160b3472a938780782937187c44bcdb8b729a35f61

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