Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a6dfae38addf81c…

MALICIOUS

PDF

80.1 KB Created: 2021-09-09 11:11:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ba9300e77e0f2b0de5d61ea96788d51f SHA-1: 2869b9753bc654bcee116f834f8c054972ad7422 SHA-256: 9a6dfae38addf81c81895d3ebd1430fcfb9a6161ad0a90a2d66298125c078bbd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, many pointing to disposable domains and employing UTM parameters, suggests a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights this tactic, indicating the document's purpose is likely to distribute malware or phish for information through these deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jawarakreasi.com/file/64271706941.pdf In PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613417128e3b6---89264234084.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/pitaxagipufepigibivu.pdfIn PDF document text
    • http://busto-wl.gattinonimondodivacanze.it/themes/userfiles/files/xofimisatodoran.pdfIn PDF document text
    • https://camphacement.vn/upload/files/dejuvovuxubig.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/67191606078.pdfIn PDF document text
    • http://lycee-elm.com/userfiles/file/vaxarudu.pdfIn PDF document text
    • http://khocabien.com/uploads/files/nukazokifakatoxamukotome.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/biwepugakuregexudakeraz.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/manorasekuruwu.pdfIn PDF document text
    • https://textosl.com/upload/editor/file/45109222169.pdfIn PDF document text
    • http://rewitex.pl/userfiles/file/47958497242.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/juzopuv.pdfIn PDF document text
    • http://cesvil.it/filesUploads/file/17154820032.pdfIn PDF document text
    • http://tfforming.ru/d/files/fajeret.pdfIn PDF document text
    • http://instalater-macecek.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/22498313258.pdfIn PDF document text
    • https://fuze-pay.com/ckfinder/userfiles/files/kilusa.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/kemikexawu.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366c105641a---jidoritapaxarubefiboze.pdfIn PDF document text
    • http://olympusflights.com/files/files/migegugowiba.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/bomifi.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/notoburedetilubisebum.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/kumerepovatawanino.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/63056652156.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/dakaz.pdfIn PDF document text
    • https://redengewinnt.com/userfiles/file/tuzaponidorigogafonikabin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=blackmart+like+appsPDF 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_off0000d639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD639 17312 bytes
SHA-256: 8979c881ab6099489320934a4ecb2b06f46daefe0006a51125c4d2239ce0f936
font_01_sfnt_off00010331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10331 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B48 10456 bytes
SHA-256: 21efe78a7d8cc91a2b118ba1f2eadfbad9e1e4446d2d86b21f3cf79e1850b5ac