Malicious PDF — malware analysis report

Static analysis result for SHA-256 bac1f57a8eed98fd…

MALICIOUS

PDF

82.6 KB Created: 2021-09-14 07:33:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1bddf9d3d3b5b1845609c2321e5dd51b SHA-1: bc2b8845ef19deaa91dd40463bb8511febcf5b07 SHA-256: bac1f57a8eed98fdc38c4beb2175c00dfd944ebe572d049670c8f638eb9f9f4b
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristic firings indicating malicious intent, including random URLs and link farms on disposable hosting. The ML classifier and ClamAV detection strongly suggest this is a phishing or malware delivery document. Although no scripts were explicitly extracted, the presence of external URIs and the PDF_RANDOM_URL_LINK heuristic indicate the document is designed to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 https://dolaodong.com/userfiles/file/lomozavobajogak.pdf In PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9175617f2---29064112085.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/33734370722.pdfIn PDF document text
    • https://foodexgida.com/uploads/files/bafadugusujomeloko.pdfIn PDF document text
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/zuzomosadimu.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/nugibesowarivenuvo.pdfIn PDF document text
    • https://dcimx.com/files/30884607753.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/zimagezawuzafidurokaw.pdfIn PDF document text
    • https://nomortiga.com/contents/files/49848378555.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/nomizitunovomufolu.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/62130294431.pdfIn PDF document text
    • http://www.s-prom.si/fileupload/file/tirezije.pdfIn PDF document text
    • http://benetalent.com/upload/files/34593481996.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/jewefiladudusupivupavaz.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/87514481279.pdfIn PDF document text
    • http://npk-bypassdrr2.com/file_media/file_image/file/91421938114.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210909225350.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/78f0mc5as4055iub8ch44eut04/41590829017.pdfIn PDF document text
    • http://gamecoast.by/uploads/files/kirejir.pdfIn PDF document text
    • http://ufcnagykanizsa.hu/userfiles/file/78450688124.pdfIn PDF document text
    • http://jumpstart.mobi/userfiles/file/sogolo.pdfIn PDF document text
    • https://9ja-bet.com/userfiles/file/45557686504.pdfIn PDF document text
    • http://gazdalkodjokosan.hu/img/userfiles/file/18679873530.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/mejofatosiwudiwufigarop.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/87000649988.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210901_C8E6D5289EE058BB.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/xuborojuleje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=enable+qr+scanner+on+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_off0000dcb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB1 10532 bytes
SHA-256: 048a20d2758a1468bc22076df71955a54bbe4a17aea49504c6402a356e4651d9
font_01_sfnt_off0000f487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF487 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C99 18580 bytes
SHA-256: 6ece8648197487503ae24006e4ff2c1e0c7c188c55d40bb203203d22bdf1b7a1

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