Malicious PDF — malware analysis report

Static analysis result for SHA-256 a71f3704695f31a0…

MALICIOUS

PDF

81.1 KB Created: 2021-09-18 21:06:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e61e6d93862fe13978e555bd3b7f2407 SHA-1: b07c5b8144332bb9e489d7f4c50921c420484977 SHA-256: a71f3704695f31a092ec55469e01ad58737fb2da54293b9dd8518ff8da1a1386
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous external links, many pointing to disposable domains, strongly suggests a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://denda.co.kr/ckfinder/userfiles/files/69964004373.pdf In PDF document text
    • http://lnhaihui.com/userfiles/file/20210911150725_402441167.pdfIn PDF document text
    • https://nhomphuongnam.com/upload/files/kutumakezivobeloduzefuj.pdfIn PDF document text
    • http://crestviewshopping.abwingsmd.com/uploads/files/40808161814.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/8d5f15e7d61d3271f03811b366c72983/depetavaxivafolopo.pdfIn PDF document text
    • https://alexspa.pl/userfiles/file/xobugawimixemuxefu.pdfIn PDF document text
    • http://klaaswester.nl/img/file/taxebasujoro.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/rozutenutenujarogijesug.pdfIn PDF document text
    • http://globalbizkorea.com/userData/board/file/wimeroraduri.pdfIn PDF document text
    • http://seatraderhk.com/userfiles/pafidolujabuje.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/81839020812.pdfIn PDF document text
    • http://gidromall.ru/img/uploads/file/63764988589.pdfIn PDF document text
    • https://jackinthegym.com/uploads/files/202109021652306282.pdfIn PDF document text
    • https://035620126.tw/upload/greenkitchen/files/65197537228.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/buzakajafame.pdfIn PDF document text
    • http://mannadey.in/FCKeditor/file/tonumitezoba.pdfIn PDF document text
    • https://jamurgoreng.net/contents/files/junefomovevebevo.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614513b3e6984---47902958468.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///20219164166053.pdfIn PDF document text
    • http://bud-drog.pl/userfiles/file/fufumasanena.pdfIn PDF document text
    • http://dongkoo.com/uploads/editor/files/felanamu.pdfIn PDF document text
    • http://immobilieninvestors.com/userfiles/file/dujinejarameto.pdfIn PDF document text
    • https://egc.ecrom.work/syo/files/nuzavuxonolefopoxijara.pdfIn PDF document text
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/zawaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=gunship+battle+new+version+mod+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_off0000d6e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E9 11180 bytes
SHA-256: 55dfc324bcf1920245f6919ac6a6c5fa8b1c71c747a1a91d4c24353e27306efb
font_01_sfnt_off0000f0b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C9 18076 bytes
SHA-256: 00d48b608a14c370ad34855e2ed5f867a8d2657fac312e537dd9f9610d40ec2a