Malicious PDF — malware analysis report

Static analysis result for SHA-256 df57708c93731de0…

MALICIOUS

PDF

81.1 KB Created: 2021-11-14 03:05:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 05861bfd157266f2f6ec419252bfb56d SHA-1: 49ab4e0fafffeeab1a04a5a95d92cecc09b77d97 SHA-256: df57708c93731de084c93db5df494faa9a7c3c73d9e798bd03143c2dc5993f36
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs that point to a link farm, suggesting a phishing or SEO poisoning attack. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity, potentially involving JavaScript for exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://clinicaveterinariamontecchia.com/userfiles/files/73037195212.pdf In PDF document text
    • http://ayrh.internet-match.com/upload/files/pewikomasapepuzijizoxibuk.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210926_D964413E388AF056.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/20211142316371709.pdfIn PDF document text
    • http://jia-longsofa.com/uploadpic/jialong151126/files/202110180420064655.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210918134442_ltfpso.pdfIn PDF document text
    • https://iqrainternationalschool.org/_assets/files/takaw.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/biluxo.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/5ookn8jrfaf42ooqpqb0qtq22a/52396431228.pdfIn PDF document text
    • http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/xuvasa.pdfIn PDF document text
    • https://sambelteri.com/contents/files/kogake.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/takeponijowejutepa.pdfIn PDF document text
    • https://dukeofmarshall.com/ckfinder/userfiles/files/vowosixole.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/02e4d9e1cd7cea0f89ff641e038a4bb4/xipata.pdfIn PDF document text
    • https://tunapvietnam.thietbiotoviet.com/Images_upload/files/runosesifejiwikezo.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/pupiporogilumojuwukida.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/wejurugowizemekiwokid.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/59120858356.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/dirixolotegubunosuk.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/lojosedajiwinapufesiden.pdfIn PDF document text
    • https://vinamex.info/uploads/news_file/zuwipigidivitiredawufa.pdfIn PDF document text
    • http://placidlakes.com/larpm/uploads/file/62145669724.pdfIn PDF document text
    • http://hatdesechia.com/storage/ckfinder/files/zuluwotavelemuvusutavigog.pdfIn PDF document text
    • http://livestocktool.com/d/files/96572352140.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/wobajelew.pdfIn PDF document text
    • http://stisk.com/file/kitamimabefopukof.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/HTGXzuRVGb4/uplcv?utm_term=cherokee+symbols+and+meaningPDF 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_off0000d80d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80D 17956 bytes
SHA-256: c364310a487276e4cbc2cc037072986910d12449f6ed68e5125cbdb3f9b3e309
font_01_sfnt_off0001067b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067B 16540 bytes
SHA-256: 45015263e28dbf00792e0fa83ae0fb9123af5110209f191c00797c49350166ef
font_02_sfnt_off00011da1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA1 10976 bytes
SHA-256: 407d13618f402e748192413576bac36bc0d1d8ed755412317412681592065c8f