Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dc5a39f4bc5f6b6…

MALICIOUS

PDF

85.0 KB Created: 2021-09-20 22:03:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 255eca18ae49d65c7a85104647dc128a SHA-1: a0bbcca64b529bb74483ecb54ba6fd2e8b2beb4c SHA-256: 6dc5a39f4bc5f6b6d23de6efa900d92be2eee416d534bb09f7687d0fbd05ff53
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and ML classifiers also flagged it as malicious. Heuristics indicate it functions as a link farm, directing users to multiple distinct hosts, which is a common tactic for phishing or malware distribution. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://analogsys.com/uploaded/file/136200037613fc847caa57.pdf In PDF document text
    • http://pyroglobal.sk/app/webroot/files/userfiles/files/rizojub.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/42557780802.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16143667465bf4---bajakederezifipoxuluxas.pdfIn PDF document text
    • http://manu-transport.com/documents/file/95502093803.pdfIn PDF document text
    • http://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vabijizukatumuj.pdfIn PDF document text
    • http://etre-belle.su/images/file/jobazuviwumixizupubaxer.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/91131493091.pdfIn PDF document text
    • http://www.romanschatztruhe.de/img/files/voweporagug.pdfIn PDF document text
    • https://sarenpinler.com/calisma2/files/uploads/73399391266.pdfIn PDF document text
    • http://hwayoung.kr/upfile/files/62699153970.pdfIn PDF document text
    • http://naphogacomposite.com/upload/files/63215432149.pdfIn PDF document text
    • https://j26clean.com/upload/files/96814836969.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-3/20210903000528970986.pdfIn PDF document text
    • http://1qjd.com/upload/files/2021-09-11-23-11-15-QIV4RSEU.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/4801896718.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c0b02e9ba---70721927451.pdfIn PDF document text
    • https://1tlstar.com/storage/uploads/files/34940370260.pdfIn PDF document text
    • https://isosklo.cz/uploads/36071746559.pdfIn PDF document text
    • https://fotokeramika.bg/userfiles/file/rapibozunilipepiwoj.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/6803045253.pdfIn PDF document text
    • https://ev-owners.jp/userfiles/files/zifetosefojirewimu.pdfIn PDF document text
    • http://hybsch.it/upload/file/zojoxanule.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=fts+14+androidPDF 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_off0000eaca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACA 17380 bytes
SHA-256: a6ed630518f1566a57c2767b3ed6a744ed0bbcd1b1cb7d162e0a7a91413b8b42
font_01_sfnt_off000117c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C7 10168 bytes
SHA-256: db6d1e874a20720d8e930c1012d63fc017ac50dcc367296d8d793c310bb66d4a
font_02_sfnt_off00012eb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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