Malicious PDF — malware analysis report

Static analysis result for SHA-256 d35b421bcf61ba22…

MALICIOUS

PDF

69.4 KB Created: 2021-09-25 04:05:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e9aef17c48555419e5e2bab2af2a1cce SHA-1: e609fc04dc0841c214664127bae0833093bd58e5 SHA-256: d35b421bcf61ba221feb8615e1f0afeaa88ba84df5edbb43bc3b711bd6303053
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged as a phishing lure by multiple heuristics, including its small size and image-heavy content designed to hide clickable actions. The document body is heavily obfuscated, but the presence of JavaScript and numerous external URIs suggests an attempt to redirect the user to malicious content or download a second-stage payload. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://amy-tsai.com/images_express/userfiles/files/78177272609.pdf In PDF document text
    • https://tssch.in/tssch/application/admin/uploads/file/fosafebirusulitedovek.pdfIn PDF document text
    • http://chixue.com/uploadfile/file/20210907073231.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/5111197057.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/13412003233.pdfIn PDF document text
    • http://cmsrecuperocrediti.it/images/file/bevepekimusuju.pdfIn PDF document text
    • http://aqcorth.specialty-match.com/upload/files/ronosiz.pdfIn PDF document text
    • http://e-hematologica.com/users/file/gegikeseful.pdfIn PDF document text
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/83478278486.pdfIn PDF document text
    • http://ozona.pt/js/fckeditor/editor/filemanager/connectors/wysiwygfiles/file/40980807375.pdfIn PDF document text
    • http://skupka23.ru/upload/m/64433411187.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/nalukawapubufumovibe.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/jamej.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/porexeralodefum.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de430e9625---xukugo.pdfIn PDF document text
    • https://greenways.at/userfiles/file/29098752697.pdfIn PDF document text
    • https://abogadosaccidentealicante.centralcms.cloud/galeria/files/fisexubor.pdfIn PDF document text
    • http://tries.cz/media/images/upload/file/pufiruwowonakamejok.pdfIn PDF document text
    • http://rambud.pl/uploaded/file/2011873949.pdfIn PDF document text
    • http://aajude.pt/backoffice/ckfinder/userfiles/files/19496993802.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/losod.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/mefonaregelanid.pdfIn PDF document text
    • https://idosekotthonaveresegyhaz.hu/files/files/97572479797.pdfIn PDF document text
    • http://turchifiltri.com/userfiles/files/85679374439.pdfIn PDF document text
    • https://ccaquebec.com/userupload/files/vonimidebalinu.pdfIn PDF document text
    • http://kabinet.puzat.ru/marafon/uploads/files/zivakesamakuxikakepa.pdfIn PDF document text
    • http://tearose-kitchen.com/sites/default/files/images/imcefile/devewodexowiguguvaxufizof.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/98123951213.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=menace+to+society+full+movie+123moviesPDF 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_off0000b197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB197 11016 bytes
SHA-256: 77e77619a7a43b59e7f9d145ee398344a1ff01c80ed3060ba0bc17560acae6d3
font_01_sfnt_off0000cb60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE372 13960 bytes
SHA-256: c8a85ff85f99ac24bba2168228986100ff7f72d0bdb58b446a43b67d78510442

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