Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c025ceeacadc724…

MALICIOUS

PDF

86.2 KB Created: 2021-09-18 20:47:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a1b6618bff79ad32bde50b199fb10f3b SHA-1: 423e5814b13014b6828e2513f4d3ac352b362bc5 SHA-256: 5c025ceeacadc724f250acc65e1704159f6a3ab4e3c89c25ef2b6403cb445a81
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to external websites, many of which appear to be part of a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of malicious intent, such as distributing phishing pages or second-stage malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • 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.
  • 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://ketchas.ru/uplcv?utm_term=what+is+the+best+android+game+in+the+world PDF link annotation
    • http://paoladebenedetti.eu/userfiles/files/13986206622.pdfIn PDF document text
    • https://www.delaneyllc.com/ckfinder/userfiles/files/44250711975.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/41368692568.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/50929872696.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/durezuvetowobidatonabolup.pdfIn PDF document text
    • https://pima-alarms.eu/slicice/file/84081142988.pdfIn PDF document text
    • http://tythb.cn/uploadfile/files/wukexoxupemejufef.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/54419301261.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/18285338302.pdfIn PDF document text
    • http://trungnguyenjsc.vn/uploads/image/files/xuwifovupixosizojep.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/mofolerewubedi.pdfIn PDF document text
    • http://didula.com/img/file/jiwazinoboku.pdfIn PDF document text
    • http://ruresept.ru/files/file/21801432159.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/kerejimaduk.pdfIn PDF document text
    • http://tangiahoang.vn/Images_upload/files/10866711354.pdfIn PDF document text
    • http://miryangpension.com/FileData/ckfinder/files/20210908_0C63F8A01442B84A.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/tulobatodege.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/14135157398.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/1654176124613e92671fbf3.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/674372695613358b879896.pdfIn PDF document text
    • http://bluelakehomestay.com/uploads/image/files/bupudaluxofowaveta.pdfIn PDF document text
    • http://www.jysunshine-hotel.com/up_files/file/torugisululexomarejiw.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/geralaporix.pdfIn PDF document text
    • 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_off0000ed80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED80 17200 bytes
SHA-256: dd71980fb5b4306ee51dac550b399b1cfcf5279d59839a4c5eddcb3d054bfd59
font_01_sfnt_off000119ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119EF 10916 bytes
SHA-256: 6da67ec6d5243cf9a4d6e0fd2ab24b6c8d5f6a099a23b9d7a77203fbafb68121
font_02_sfnt_off000132d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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