Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7e30c2a0e13ba90…

MALICIOUS

PDF

81.8 KB Created: 2021-09-11 04:43:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 6714c7a0dbffd8ed99063b2029d3962c SHA-1: c6a11c20454d684358338bc71a08b9c9c1ed2ac4 SHA-256: c7e30c2a0e13ba9068cc412b6d449d2783cce62d5aaf1c0fcb1f69b21f813581
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external URIs, including one pointing to a raw IP address, indicating a likely attempt to redirect the user to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and URI usage are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://allaboutdowney.com/userimages/13790163828.pdf In PDF document text
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/95350665636.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/pasopaxex.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/97585584169.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/11453574407.pdfIn PDF document text
    • http://goldenstarhotel.vn/images/uploads/files/88206799292.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210904_F48FD5BAD19697EF.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/96908203634.pdfIn PDF document text
    • http://kliknetezde.cz/admin/obrazky/file/komumur.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/6817745794.pdfIn PDF document text
    • http://skkl.cn/filespath/files/20210902030151.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/juvikemaxalapizelajebiwaw.pdfIn PDF document text
    • http://onelove.cz/file/kebokisuru.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/65566999697.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/81305057031.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f004915737---25237248548.pdfIn PDF document text
    • http://residencelesaline.it/userfiles/files/36904027679.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/dfc39b28fd370b65ca14ae42185d8549/84173986160.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210904_247DB2272D012DAF.pdfIn PDF document text
    • http://email-database.info/userfiles/file/nefowitopugopojo.pdfIn PDF document text
    • http://140.121.161.111/ckfinder/userfiles/files/ketorexirebuvudiwurosij.pdfPDF link annotation
    • https://grootformaatspandoeken.nl/userfiles/file/34561160362.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=the+alchemist+malayalam+pdf+freePDF 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_off0000d9c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D4 18068 bytes
SHA-256: f3e76503c19a404e1a27cc3ac9a10721825f673ecab139dd48b7c651b1de0a86
font_02_sfnt_off000120c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C8 10736 bytes
SHA-256: 2039c5aeea1a58b574dabb0a817053cc3b8f5549c2bab1472f07aff4b641fc6c