Malicious PDF — malware analysis report

Static analysis result for SHA-256 77b3e2fe7d441415…

MALICIOUS

PDF

89.5 KB Created: 2021-09-19 20:29:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 38362bbaca3fa83f857654676d881951 SHA-1: 3933a728bea0dc5cc2ffc374277bc40a0c44251e SHA-256: 77b3e2fe7d441415ad662cb17ffe8bc4337e08a0613d6872b4069a98a9a2ac5a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, many pointing to unknown domains, suggesting a link farm or phishing lure. The presence of a 'download button' heuristic further supports a deceptive workflow. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://youngshiny.com/userfiles/file/1630997254.pdf In PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/mimunanu.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/75878378140.pdfIn PDF document text
    • http://yjccnc.com/upload/files/72076430225.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/kadowisekoreze.pdfIn PDF document text
    • http://xyr59.com/filespath/files/20210907151732.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/650979e749287902aa190580e06fc44f/bevumavapevosowofire.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/jetewosisel.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/nenokujuxegalekog.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/5729245871.pdfIn PDF document text
    • https://wspaperbag.com/userfiles/file/wukerumiwaxibuwuj.pdfIn PDF document text
    • https://luminex.pl/upload/file/fopuzipifimerut.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/ferotazetazubipodeze.pdfIn PDF document text
    • https://unchiulmihai.ro/files/fckeditor/file/pujopezerotimebakuwazu.pdfIn PDF document text
    • http://pneusmarene.it/images/file/kazisijalevix.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/pusomebubulanepizis.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/vokavexotugexolip.pdfIn PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/fufal.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/kemikexawu.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/34f85301e9c6ee94bb4969df240bdb16/2570176172.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/pafoxokekabegixutun.pdfIn PDF document text
    • https://fizjolech.pl/userfiles/file/42781093051.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/80551915571.pdfIn PDF document text
    • http://weilandvloeren.nl/fckimages/9796113605.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=mortal+kombat+2021+full+movie+putlockersPDF 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_off0000f64f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64F 11224 bytes
SHA-256: 1509eb112b6eb66ca038d4625d5371bfbac6e5407e182a3e5102a74f020ec879
font_01_sfnt_off0001108f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108F 18092 bytes
SHA-256: 3194e64ff8e0b4ede6123496d0677f2db2e609fa56f3e784a0ab22187891e933
font_02_sfnt_off0001400a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1400A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1