Malicious PDF — malware analysis report

Static analysis result for SHA-256 a85dc7d67a2bb6fd…

MALICIOUS

PDF

85.2 KB Created: 2021-09-14 20:06:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6ddd50e98e586abda8e260e83cd83227 SHA-1: 5f679a70ebbfc0f97e1b463efeb41a7e1ea80e04 SHA-256: a85dc7d67a2bb6fd4061f5e86f1af095ecc113ba7390627a28b8552f3a14a82f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to external PDF files hosted on various domains, indicating a link farm designed to redirect users. The PDF's structure and the presence of external links suggest it is part of a phishing campaign or a distribution mechanism for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://hunglivet.com/uploads/files/202109081428479885.pdf In PDF document text
    • http://piazzademarini3ge.com/userfiles/files/nivitajeresu.pdfIn PDF document text
    • http://pnalog.ru/images/file/3486162374.pdfIn PDF document text
    • http://indianmailbox.com/assets/images/userfiles/files/81620476146.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/novovosilodot.pdfIn PDF document text
    • https://htijsr.com/userfiles/file/68258547230.pdfIn PDF document text
    • http://tivatijapan.com/uploads/userfiles/file/temabotulegumadamajosuba.pdfIn PDF document text
    • https://isagrinio.gr/userfiles/39907660675.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16132d0c92ba8b---lewog.pdfIn PDF document text
    • https://tepatsasaran.com/contents/files/dubobibozexutitiri.pdfIn PDF document text
    • http://fields-on-earth.com/images/blog/file/xesakatuvovatov.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/fiferevaxalesoduzeze.pdfIn PDF document text
    • https://www.seblocation.com/ckfinder/userfiles/files/tabul.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/wixodepafedukavelumonipes.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/xulutinusafagi.pdfIn PDF document text
    • https://robertbah.si/files/file/44950272964.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/visifosisijubixavud.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/91915094280.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/25724564691.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/xutejibisuguviwidoka.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/92599709186.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/dewikoxofikidelujajif.pdfIn PDF document text
    • https://f2h63c2.ip4secure.net/upload/files/98831913310.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+erase+data+from+android+phonePDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e81c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81C 17620 bytes
SHA-256: 43895b59366f6143949f3ff9184e731b0a4d8379e523c52423c5998ab423a771
font_01_sfnt_off00011635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11635 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E4C 10792 bytes
SHA-256: ac15cf9226b3b41e4044defd5bfd125dad237ab8790741eafa4c979136cf80a5

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