Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff95dada899f4e09…

MALICIOUS

PDF

80.1 KB Created: 2021-10-10 19:36:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b2c5f9839df569a0b0b86402217926c1 SHA-1: 6f24580424d0f03c7d264bb72c3319cad132aa96 SHA-256: ff95dada899f4e09008f1a2754d853971f4d6458ffd77b2ef5e9321621b9f572
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

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://chcial.ru/uplcv?utm_term=top+100+conservative+sites PDF link annotation
    • https://goldengatetaichiqigong.com/userfiles/file/70160300727.pdfIn PDF document text
    • https://norservis.cz/files/files/81504164959.pdfIn PDF document text
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/ponatinugezetabizubiselub.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/21362883260.pdfIn PDF document text
    • https://salonrewards.ca/images/file/mijibitil.pdfIn PDF document text
    • http://mamitobe.ru/files/file/20868339515.pdfIn PDF document text
    • http://eubeer.vn/uploads/files/migewepubobolivexulegamin.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/183a517b7a24f92b96e57657b5eb8522/titilozatuxunidezulugajas.pdfIn PDF document text
    • https://srccaa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/fesonuminopabusafi.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/18416070931.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/86218406632.pdfIn PDF document text
    • http://rainternacional.com/userfiles/file/pekakozewuwigotifozinar.pdfIn PDF document text
    • https://035620126.tw/upload/greenkitchen/files/31647856741.pdfIn PDF document text
    • https://rajatotogroup1.com/contents/files/dalugezoduvelogigubuxiguz.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/sibodezexuvivixol.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/95083149291.pdfIn PDF document text
    • http://www.pataniforum.com/admin/jquery/ckfinder/userfiles/files/xiwugamujebuvut.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/34870377980.pdfIn PDF document text
    • http://ambartakip.net/belgeler/file/tobilugunatek.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/9722270679.pdfIn PDF document text
    • https://concurs-euclid.ro/upload/fck/gegatuwono.pdfIn PDF document text
    • http://retailcop.ca/files/maliboboza.pdfIn PDF document text
    • http://sun-dr.com/uploads/files/202109152316596427.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AC 16888 bytes
SHA-256: 42ffcf7032340aaf70e37c895fada3821bc8314d4080a0126b6660d0eadef1fc
font_01_sfnt_off00010279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10279 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A90 10524 bytes
SHA-256: 7dd37803ac2ad1ff3ad6c71c52747b2816005ffd8c3b15c01399b03472c66ba9

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