Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea0f3a1ea3967ad1…

MALICIOUS

PDF

67.6 KB Created: 2021-09-20 18:58:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6706932022d43d9fff305349ab8fa1e5 SHA-1: 9616c5b89bc50a21203a55585f44828c6793e6ee SHA-256: ea0f3a1ea3967ad154d5a3b17d046aeae6bbb1d8a2c9990a81103c76bf194f23
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure indicate an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://allytemp.ru/uplcv?utm_term=download+mms+android+phone PDF link annotation
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/15328420095.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148461ef2255---32666003156.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210910_025329.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210917_AB072C13BC4F3062.pdfIn PDF document text
    • http://tythb.cn/uploadfile/files/xovibenanube.pdfIn PDF document text
    • http://okun.su/upload/file/74218985264.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/dedukizimujop.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/161423498cd4a8---lebazukokekovod.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/20219122563784.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/kerugiruribe.pdfIn PDF document text
    • http://idominjazz.com/fckeditor/userfiles/image/kodumakob.pdfIn PDF document text
    • http://didula.com/img/file/21887113655.pdfIn PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/43111852534.pdfIn PDF document text
    • http://vietsinphar.com/uploads/files/rejezifozezun.pdfIn PDF document text
    • http://foreverymuslim.net/home1/forevev3/public_html/foreverymuslim/upload/file/43028100909.pdfIn PDF document text
    • http://weilandvloeren.nl/fckimages/wapotima.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/zuvizebuwimowizuti.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/fakikakoxir.pdfIn PDF document text
    • http://idevicesplus.nl/app/webroot/files/userfiles/files/13253618022.pdfIn PDF document text
    • http://venkateshservices.com/uploads/sojaforomekojexujebita.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/23521643146.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_off0000ac1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC436 10648 bytes
SHA-256: b722c513f80fbf72d866efbc6dcba0fd1fb73f34a8a4fea8377ad5d5168081d1
font_02_sfnt_off0000dc59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC59 14572 bytes
SHA-256: 9adfbed0c0db66859f77c91ac64912bbf052597da352fb72712eaabfa8c0ab79

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