Malicious PDF — malware analysis report

Static analysis result for SHA-256 78a5fc7e66a86776…

MALICIOUS

PDF

69.2 KB Created: 2021-09-28 03:44:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 845612ba2fb17b10b412230b19477fc9 SHA-1: fa437e0cd03ff653bd45d2541d9ea60d1b91d02e SHA-256: 78a5fc7e66a867766b14996ee0fc4a7bf66cad669c7c9aee5c6abdede83df68f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple disposable domains. The embedded URLs and the PDF structure suggest an attempt to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://geofer.eu/userfiles/files/89789011928.pdf In PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329133cfb43---90509948704.pdfIn PDF document text
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/bisitulot.pdfIn PDF document text
    • https://dacola.com/upload/files/bavexamif.pdfIn PDF document text
    • https://clinicscrm.com/img/files/natagabizeru.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/69ab7d934987e71772902aefa64428a4/vuzize.pdfIn PDF document text
    • http://hk888.edo2008.com/com/comimg/file/20210915_180110_165.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/83224431568.pdfIn PDF document text
    • http://zoscm.zohukum.com/ckfinder/userfiles/files/44636463687.pdfIn PDF document text
    • http://konditsionery-zheleznodorozhnyi.ru/upload_picture/file/bufozodazibebut.pdfIn PDF document text
    • http://www.tempshift.com/app/webroot/files/uploadimagesfile/xatovadimubifedi.pdfIn PDF document text
    • https://letajicikoberce.cz/userfiles/file/tojopapolilafaxewiluv.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/21767348280.pdfIn PDF document text
    • https://vendax.ro/files/file/98248395841.pdfIn PDF document text
    • https://ptogel1.com/contents/files/bobabetowosejinuvixamibim.pdfIn PDF document text
    • http://kht.civilkozpont.hu/uploads/file/31887127886.pdfIn PDF document text
    • http://seatraderhk.com/userfiles/fijatufoxegutez.pdfIn PDF document text
    • http://unite-chem.cn/upload/files/dituwivorejifenosajepoto.pdfIn PDF document text
    • https://www.dtd.com.pk/ckfinder/userfiles/files/xupijojijagiwubilapuz.pdfIn PDF document text
    • http://business-baltic.com/myfiles/dok/sebasolepig.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/vazuligamik.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/27281991475.pdfIn PDF document text
    • https://hgb.se/filer/file/ruwesefisekejojagi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=11+pro+vs+s20PDF 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_off0000af37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF37 9876 bytes
SHA-256: 2c6b88537b7af2e9d14bf1ae0d2f1b0a45206d8ee10bd85a09c92fcfef745b7c
font_01_sfnt_off0000c517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC517 16692 bytes
SHA-256: fb15d88bd365a8197fe1486199cda9b0db2929794b4698dfc857a33576240c8b
font_02_sfnt_off0000efb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1