Malicious PDF — malware analysis report

Static analysis result for SHA-256 701dc7fdb7917566…

MALICIOUS

PDF

84.4 KB Created: 2021-09-19 08:59:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: df5ea70b1c78f04bc91f57322d96855e SHA-1: 1a603509b0512795963eb7d55df4fa26d93365f7 SHA-256: 701dc7fdb79175666af55e3e9d7eaad8a60a7d63a70f4ff9cbabc8bb28167cf5
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to domains that appear to be part of a link farm, suggesting an attempt to lure users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this behavior.

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 http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/begosutigog.pdf In PDF document text
    • https://livewireeventz.com/userfiles/file/48777089535.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/31145029634.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3b03dd422---82817659969.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/xegatidudu.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/xamemadomujurusapa.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/sanubigagofilekugeva.pdfIn PDF document text
    • https://karatenarrewarren.com.au/ckfinder/userfiles/files/surajafojadobinevolaz.pdfIn PDF document text
    • http://safetruck.gr/images/file/nitepeninawijinixisoboji.pdfIn PDF document text
    • http://embeddedhr.com/ckfinder/userfiles/files/rutukifejefogivekone.pdfIn PDF document text
    • http://tai-group.com/upload/files/burilozupupubupanofor.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/45726979218.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/52555699523.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/jagozuzibevedarojeteza.pdfIn PDF document text
    • https://praktijk-fix.nl/userfiles/image/file/sitefujup.pdfIn PDF document text
    • http://aalzkj.love-mrt.com/upload/files/37315947725.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/witefenojivixilijuwemax.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/44951185279.pdfIn PDF document text
    • http://ztracenaexistence.cz/files/content/file/dajinokalukegoruraki.pdfIn PDF document text
    • https://stephankeppel.com/userfiles/file/kulirokigazetasiput.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/70356566308.pdfIn PDF document text
    • http://namkhoabacninh.com/images/files/fejujeroz.pdfIn PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/43566581972.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=android+augmented+reality+open+sourcePDF 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_off0000e075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE075 11052 bytes
SHA-256: a5b6798f8bf0c9bdc193e8e14231d6c954fea1bb2069b43c21623ca11297e5bc
font_01_sfnt_off0000fa08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001121a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1121A 18800 bytes
SHA-256: 08b67e76dd807226e62bdc9da6f096eba7dae9eff5bc2e7441f6993744b6c070