Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2a93a86982a5957…

MALICIOUS

PDF

83.0 KB Created: 2021-09-10 20:55:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 849f45328b77f9ce93f027f14a2c9a53 SHA-1: 4106ffebe4c26e22e22ce396fb88e698e3b212bf SHA-256: e2a93a86982a5957fb57d8cf42e80e5c8cfe03e4576b52746c09a3a1d2d0c84d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates the document is designed to host numerous links on disposable domains, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://netpage.info/userfiles/file/29736574068.pdf In PDF document text
    • https://devcons.org/uploads/userfiles/files/52784233881.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/47154255893.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b531fb4534---tomukifa.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/bubakubokoloborisi.pdfIn PDF document text
    • http://alvit-bk.ru/userfiles/file/kexabakuguvigawilu.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/jijujaminam.pdfIn PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/46072850845.pdfIn PDF document text
    • https://iphastkala.com/userfiles/file/wikudejesop.pdfIn PDF document text
    • https://balarampurblock.in/ckfinder/userfiles/files/mapigazumag.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/xemotoli.pdfIn PDF document text
    • https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/powulumipukojalume.pdfIn PDF document text
    • http://avtokit116.ru/!upload/files/lifurag.pdfIn PDF document text
    • https://tonmathunglan.vn/upload/files/kuredovosamigikofojo.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/93880289293.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/zaniz.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/widagitaludafofulus.pdfIn PDF document text
    • https://grandegroup.net/files/vukivaxad.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/51805617610.pdfIn PDF document text
    • http://websurin.net/UserFiles/File/2878353334.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/2c76278ec21a7b78179fffb162dcb9d1/zejalinapufavazo.pdfIn PDF document text
    • https://madame-tina.com/ckfinder/userfiles/files/kefatixoma.pdfIn PDF document text
    • https://smartmedia.ro/app/webroot/files/userfiles/files/gokexej.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/jodasiganuwakatetuta.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=mp3gain+para+androidPDF 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_off0000dd86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f59d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59D 10288 bytes
SHA-256: 76a83ac05ab2ec5642ee180d6ce6811f84e465bfdcb75e58598747d127309d1f
font_02_sfnt_off00010c95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C95 19376 bytes
SHA-256: df876ad25a2ba3217c8455a48aec4c0899dfb6c1663135a0dc4a92cc91e1038d