Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1d7356e4b9c41e6…

MALICIOUS

PDF

86.6 KB Created: 2021-09-21 06:02:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 55fd8cbb8ba854ace648667c00777ef4 SHA-1: c8f6e775f25ebb90ddaf8794a22873ecd38fc8b5 SHA-256: d1d7356e4b9c41e655aaf0d74f82ab01e99eb89cf3c871259c9193bbe5383a78
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous other PDF files hosted on distinct domains. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially malicious content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://maisonforville.be/documents/file/50156371286.pdf In PDF document text
    • http://guss-ex.de/uploads/fck/file/tetofiz.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/xudesarukejadusibo.pdfIn PDF document text
    • http://www.toptehnik.si/images/wokefubikise.pdfIn PDF document text
    • http://e-instar.com/userfiles/file/29979157210.pdfIn PDF document text
    • https://amoslodge10-org.alljobsinliberia.com/ckfinder/userfiles/files/85723200291.pdfIn PDF document text
    • https://rainbowprinter.com/app/webroot/files/file/88386443975.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/94658272643.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/97316336896.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/15567834131.pdfIn PDF document text
    • http://stefani.cz/fck/file/linogufujigelumovubolixo.pdfIn PDF document text
    • http://soc-in.com/data/media/files/zekipepifefuzavu.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/bejemigenajivedelav.pdfIn PDF document text
    • http://newgatedesign.com/Images_upload/files/miruvilavosaxuvedavaze.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/21977920539.pdfIn PDF document text
    • http://flapboxes.com/userfiles/files/nipizavejimum.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/gapizefizagegelom.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/44327034178.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/54011258361.pdfIn PDF document text
    • https://newcar-rental.com/uploads/files/202109030606404240.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/57390935826.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/xidijimilaworix.pdfIn PDF document text
    • http://speckletrack.com/update/editor/file/jiluwiga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=mac+spoofing+apkPDF 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_off0000ed71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED71 10364 bytes
SHA-256: 1be8013777098259f646ab8da5f8b5a0b060410c19db08c8311bb6727a8b5096
font_01_sfnt_off000104ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FF 18076 bytes
SHA-256: 8744d79cf57622a0d67aade267cf0c3b1e52af9465a8090498d68e653b2b0dc9
font_02_sfnt_off00013490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13490 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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