Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b441766900a040f…

MALICIOUS

PDF

88.7 KB Created: 2021-09-10 14:15:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: 6f7cb0e5c784753b89136b68b7e7867b SHA-1: 349eac378c2b9e22443207c76088fc7f333668ab SHA-256: 3b441766900a040fed33f533f72053657fd6f298c4d5715962ffdbc02d4cc707
126 Risk Score

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 0.9977

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://smidgel.ru/uplcv?utm_term=lyric+video+maker+android PDF link annotation
    • https://mallncart.com/userfiles/files/95850615044.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021090819184082.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/72145718639.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/12184458205.pdfIn PDF document text
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/98428740608.pdfIn PDF document text
    • http://moscowballet.ru/userfiles/file/mibagiwujaluguwujimupa.pdfIn PDF document text
    • https://concertwristband.com/resimler/files/kixux.pdfIn PDF document text
    • http://jaatkinson.com/userimages/4076803762.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/duzevomebipezij.pdfIn PDF document text
    • http://vpecargo.com/userfiles/file/setifilidawawer.pdfIn PDF document text
    • http://ipllaser.in/uploads/roruvurasijumuliropefi.pdfIn PDF document text
    • http://finadev-groupe.com/userfiles/file/31240251416.pdfIn PDF document text
    • http://rld-carbon.ru/file/gotulibelewomesulexo.pdfIn PDF document text
    • https://basalyemek.com/ckfinder/userfiles/files/lubasedojogufigi.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/nifunefemimujebesofulu.pdfIn PDF document text
    • https://luatkhangthai.vn/upload/fck/file/nategabarasuliroribupa.pdfIn PDF document text
    • http://drsrkbedcollege.com/ckeditor/ckfinder/userfiles/files/juvenekugika.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/xulif.pdfIn PDF document text
    • http://dulichgiahy.com/upload/file/binifakemilapowigasilejez.pdfIn PDF document text
    • http://doorsatyrau.com/ckfinder/userfiles/files/66155051382.pdfIn PDF document text
    • http://mindennapi.hu/upload/file/zewijide.pdfIn PDF document text
    • http://afro-safari.com/upload/files/5383308877.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://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_off0000f449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF449 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5B 18888 bytes
SHA-256: 66fa578b2de7abd0984408f16dd1797d401dc4b2b74194fc53656acf6538adb6
font_02_sfnt_off00013dd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DD1 10448 bytes
SHA-256: 5edfd4b14d3ddda4ed89c67036a6149303b16bf79bde16314b3d8dba3e18036e

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