Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b73f308929a5be8…

MALICIOUS

PDF

69.9 KB Created: 2021-10-01 02:29:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 87593713b141a4aaff9007891694b138 SHA-1: df1830e2e6045d4d111fc293eca1565be82399a7 SHA-256: 0b73f308929a5be8998c79576de92013ee518940b8c400c79ddb2d6116901644
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it's part of a link farm designed to distribute content, likely malicious, through numerous disposable domains. The embedded URLs point to various unknown PDF files, reinforcing the link farm and potential distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://fivelscope.net/fckimages/botuzufepuxaf.pdf In PDF document text
    • https://cebrium.ssnn.ro/images/58087853422.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/wasabokiw.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/zirejozejutogisimofemax.pdfIn PDF document text
    • https://activepymes.com/pub/file/kidutofupavesidepujimo.pdfIn PDF document text
    • https://shoppingplanet.cityplanet.ro/ckfinder/userfiles/files/pewagevalelesavuwun.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/41805896928.pdfIn PDF document text
    • http://congtyvima.com/images/Download/57251836818.pdfIn PDF document text
    • http://thebankcardservice.com/uploads/files/65253016880.pdfIn PDF document text
    • http://majedalkarkhi.com/pics/file/nabalimivideguvo.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/24940916565.pdfIn PDF document text
    • http://zjleiou.com/images/upload/File/37617136420.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/zebedovafosusewojifugu.pdfIn PDF document text
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/daguzeziriwixopum.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/lebaje.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/zefafiwepojinu.pdfIn PDF document text
    • https://butyfarm.mm520.net/userfiles/files/dinukobuxitajapo.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/24049688643.pdfIn PDF document text
    • https://kamhosting.nl/ckfinder/userfiles/files/nilanalinadenumifomala.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/16104230020.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=contemporary+medium+of+artsPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn 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_off0000ad61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD61 17360 bytes
SHA-256: c9d381b7bcd958d8523572871083e1d637e003353f277774dd6360ded0c1ef96
font_01_sfnt_off0000d93d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD93D 10856 bytes
SHA-256: d19ab2edc5f01ef147ef7c81a1e85f5d5e9c1d30f74535fec8e08ec11d724a67
font_02_sfnt_off0000f25e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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