Malicious PDF — malware analysis report

Static analysis result for SHA-256 877a7897945eb146…

MALICIOUS

PDF

79.3 KB Created: 2021-09-13 08:09:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4652e9d4624e15d1c52b3fd3feda302f SHA-1: 8816b7fc91ae02c94bd916a260a1ad013cb45972 SHA-256: 877a7897945eb14651f26a276befe651bfc8891e3ef65509b10e46bb97d82bf8
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malicious content. No scripts were extracted, but the PDF structure and URL patterns suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • 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.
  • 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://bagiez.com/userfiles/file/sisulomizonixo.pdf In PDF document text
    • http://www.chubsorn.com/file/files/kizofurejig.pdfIn PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/gugiwapurakitunaso.pdfIn PDF document text
    • https://coluer.ir/documents/file/71059447839.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/widagixanaberelegijerijab.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/43682515925.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021090108595989.pdfIn PDF document text
    • https://cancelaria.pl/galeria/file/63421511467.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/ferilarifoliwu.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/87063179404.pdfIn PDF document text
    • https://ikansambel.com/contents/files/40269766060.pdfIn PDF document text
    • http://carraracucinecomponibilitrapani.it/userfiles/files/18407574844.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/gawefozuzuwib.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/liliwexuverixela.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/31032502134.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/5713899990.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/4b19972bdcf8770f59b9c8ac0eb7220f/bazekorofu.pdfIn PDF document text
    • http://pate4me.com/userfiles/file/5560894002.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/senupajidagituju.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/09-10-10-19-52-65.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/57377061883.pdfIn PDF document text
    • https://rais.bg/uploads/file/pavemomoda.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/losapabupodugubame.pdfIn PDF document text
    • https://iuoshili.com/upload/users/files/63044832352.pdfIn PDF document text
    • https://superchills.com/userfiles/file/sisoderugake.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=you+are+my+better+half+quotesPDF 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_off0000d13a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD13A 10764 bytes
SHA-256: 1974261a9d6087d1663898f6c6dba8d515db92925a5ec777a93b90ce87462538
font_01_sfnt_off0000ea17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA17 17612 bytes
SHA-256: fd9455011b459e737bddc94c2101dd9a94691ef2dbcf2e697ab7e4671a88bfd2
font_02_sfnt_off00011759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11759 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1