Malicious PDF — malware analysis report

Static analysis result for SHA-256 041d734677d579a0…

MALICIOUS

PDF

81.2 KB Created: 2021-09-15 10:18:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 89a673a90b6abed3badbea20810feb5d SHA-1: 1e403480c25ee5bf02e15da99f7335d03b366e30 SHA-256: 041d734677d579a04d783bac7ae9f97422945b0987778c26c59a0b4c16d45f8e
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with several pointing to suspicious or disposable domains, indicating a likely attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing or trojan PDF. While no scripts were explicitly extracted, the PDF structure and link farm heuristic point towards a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://koparieshorvathbusz.hu/files/file/puvuzovamatugosamemozowom.pdf In PDF document text
    • http://104408017.linker.tw/files/xevopunobegu.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/dogewirirukux.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/87678165139.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/dorezaromagofizon.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210901133029.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/xifemawobi.pdfIn PDF document text
    • http://yuli-china.ru/d/files/gemededamelumidek.pdfIn PDF document text
    • http://evola.it/userfiles/files/tunexuteberexozadonatet.pdfIn PDF document text
    • http://usa-ex.com/images/blog/file/kuvob.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/37516776541.pdfIn PDF document text
    • http://ambulatorioveterinariocigliano.com/userfiles/files/lefunazumufedad.pdfIn PDF document text
    • http://perfect-gallery.com/userfiles/file/72990418667.pdfIn PDF document text
    • https://datatalk.ilvzhou.com/upload/files/2021/09/202109092319351980.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/244765712a697422af5ac3076118e471/vulezipabo.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/40028313005.pdfIn PDF document text
    • http://homeopathyhk.com/files/bamepidoxorilas.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/dubizapez.pdfIn PDF document text
    • https://tutorbolivia.com/userfiles/file/91925569476.pdfIn PDF document text
    • http://finchamauto.com/pics/53090226269.pdfIn PDF document text
    • http://happyorderfood.com/uploads/files/vofurezexevolimeru.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021090813503265.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/45981924614.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2246604f2---dipevatomi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=edit+video+pc+32+bitPDF 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_off0000d9e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E6 10408 bytes
SHA-256: 8dbdd0109860056e94126a4c621ad6372c4331296fbf781a925a065db3623aab
font_01_sfnt_off0000f16c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001097e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097E 17896 bytes
SHA-256: 161dd2a379c338448dbdf2d560a7c272aa326de2fadf09bbc5445b7e8a344505