Malicious PDF — malware analysis report

Static analysis result for SHA-256 27b78fd545b70ce8…

MALICIOUS

PDF

127.9 KB Created: 2021-03-15 08:15:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: dfb58b41ad4a1fad1a99cda2d94f332d SHA-1: 5690d52a5e59fd82b4f0b75f0eab1605ee1b00d7 SHA-256: 27b78fd545b70ce85d9caf1f3bcd96dc207349fea151e63f12abf874820e4ad2
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://pelibifir.ru/strik?utm_term=how+to+start+chinese+calligraphy PDF link annotation
    • https://cdn.sqhk.co/fetebutujo/hhdidEF/55331781882.pdfIn PDF document text
    • https://cdn.sqhk.co/goxobuve/LhiBfha/xilibaroxomirazowifi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416792/normal_603d8bf789476.pdfIn PDF document text
    • http://gonimuliveza.22web.org/beautiful_rose_bouquet_images_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381730/normal_5fffd17974188.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445570/normal_5fe9e58660770.pdfIn PDF document text
    • https://cdn.sqhk.co/disumuneriva/dJbKgiD/70670852366.pdfIn PDF document text
    • https://cdn.sqhk.co/nivavepe/bWicNie/tekifisanafanotabejoko.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417652/normal_5fd76b7c6154f.pdfIn PDF document text
    • https://cdn.sqhk.co/satukevaguka/OjgibR2/thronebreaker_puzzles_mahakam.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/f38e4f1e-d7bb-4068-876e-f56686f6bb84/94317943303.pdfIn PDF document text
    • http://zejagal.rf.gd/29583974099.pdfIn PDF document text
    • http://fidekoguvibatid.rf.gd/5199703934.pdfIn PDF document text
    • http://dodarululi.epizy.com/cakewalk_sonar_platinum_tutorial.pdfIn PDF document text
    • https://45dcde1a-aed5-4138-b95e-a0f768a283bf.filesusr.com/ugd/89441e_6a336f7f17f244c2ad02f35b25a86b85.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/sepomuralazixuvejep.pdfIn PDF document text
    • https://dc6b22d1-fd3c-476a-b8f1-b0505981f591.filesusr.com/ugd/ab5adf_5bddb34268b94099b985aa6349a838a2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zizene/wakorevajupatopewegeveza.pdfIn PDF document text
    • http://fezisiw.epizy.com/ruzewawiwubujavaderu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86203940-0200-4252-b0ea-7ecfea2449aa/16167900037.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13749 43048 bytes
SHA-256: 1530c7c3a5272c7d2219de6ef92319bf984fe6047efe56a3da27ee217bd6b4d9
font_01_sfnt_off0001b83c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B83C 5352 bytes
SHA-256: 2698d8b6540f4848ac0024ed697402807942faabda96e6e6e8b786160d08df27
font_02_sfnt_off0001ca83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CA83 11500 bytes
SHA-256: 8120f00b33e1cc41646d5e04c4a91f967bf32ebd93df4a74f50bebb9811751e7

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