Malicious PDF — malware analysis report

Static analysis result for SHA-256 d073621dca8f1dc5…

MALICIOUS

PDF

70.5 KB Created: 2021-09-25 19:31:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e4fc9f5fc4dfd8ae9dd97f6252872f89 SHA-1: 2cd42dc24a66f9ab84d7edb33f7f441ba71aa5ab SHA-256: d073621dca8f1dc54c5e114ed902b7a0a37b4485701f51978affdcdc86e7a159
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, a common tactic for distributing malicious content or conducting phishing campaigns. The presence of external URIs and the overall structure suggest an attempt to redirect the user to a harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://elijasprojekts.lv/files/file/gugetirexukodudeluluduf.pdf In PDF document text
    • https://ph2020.org/FCKeditor/file/97275293886.pdfIn PDF document text
    • https://legyenegyjonapod.hu/userfiles/files/xetinavosakatapak.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/30890065.pdfIn PDF document text
    • https://duocvinhkim.com/userfiles/file/97330171091.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/pewejare.pdfIn PDF document text
    • http://mebizstekla.ru/userfiles/file/nivamekov.pdfIn PDF document text
    • https://mimpishio2.com/contents/files/kusudebalej.pdfIn PDF document text
    • https://vienhung.com/webroot/img/files/wisurop.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/09/23/282363497.pdfIn PDF document text
    • http://fruitsad.pl/images/file/85479611191.pdfIn PDF document text
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/58669742147.pdfIn PDF document text
    • http://regmac.net/userfiles/files/severumikawigij.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud/files/wolizulesofitegixifuv.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/werawewifafamubole.pdfIn PDF document text
    • https://duvarkagidierzincan.com/userfiles/file/57107429513.pdfIn PDF document text
    • http://tadimtursu.com/image/files/31279952700.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/xelidafuxesasoduwodig.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e0ad7d8eb0---48740028325.pdfIn PDF document text
    • https://nbc.com.vn/ckfinder/userfiles/files/11409378876.pdfIn PDF document text
    • https://combrooncom.com/contents/files/kavixe.pdfIn PDF document text
    • https://teater77.nl/userfiles/file/40332519648.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=activity+launcher+miui+12PDF 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_off0000af5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC776 10640 bytes
SHA-256: 68655c0ab2cdea6366beaaf24a59160f4e7235669a4cc3498dc633ce468b747c
font_02_sfnt_off0000dfba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBA 17396 bytes
SHA-256: 8e2cccdca075bbc68c2e13545b993d8cba221b6df4a49687c7f86729a68e04c7

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