Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff6fcd896a623652…

MALICIOUS

PDF

78.0 KB Created: 2021-09-14 04:13:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 9eaa49cb2a719690793e39420619915a SHA-1: 7a10112e4c7e96703cc97d6bd86959370ee67fb2 SHA-256: ff6fcd896a623652cddceaf328645aff90b2d64d8b9b3eb8a48bebd01495c184
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and numerous external URIs, many of which point to disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded JavaScript indicates potential for further exploitation or redirection beyond simple link following.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6181

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://parmalab.it/userfiles/files/92118232468.pdf In PDF document text
    • http://didopack.com/files/90026110489.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/waxud.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/datidazagarinetedupibuxa.pdfIn PDF document text
    • http://erex.hu/upload/file/49139411272.pdfIn PDF document text
    • https://luatsubienhoa.com/upload/ck/files/ronetuzofukimiragovom.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16134526d882c2---80435593523.pdfIn PDF document text
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/bebudefekudaxufal.pdfIn PDF document text
    • http://officegate.biz/admin/fck_upload/file/kosibi.pdfIn PDF document text
    • http://levakov132.ru/userfiles/file/kajekofuxovugibomaxew.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/buwanexufi.pdfIn PDF document text
    • http://asqcert.net/files/files/75583427742.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/zusifatadonogopop.pdfIn PDF document text
    • http://restauraceeverest.cz/userfiles/file/7887390920.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/79242995608.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/kogozuxagu.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/filaxizejajozolemisixeni.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/xilalubapememenegejame.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/vilal.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/nedafasodunikuta.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/5270979546.pdfIn PDF document text
    • http://cuanhuaabshanquoc.vn/files/7780264072.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=script+manager+apkPDF link annotation
    • http://www.cst.rnu.tn/js/ckfinder/userfiles/files/norawavoxen.pdfIn 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_off0000d49d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD49D 10552 bytes
SHA-256: 4047d743826a3091b71286d064e720ff41f6c9d0676fff18db5c501eb832487a
font_01_sfnt_off0000ecac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BE 18644 bytes
SHA-256: f6c791635c02df624af97ed7e0a2ff3b7fc88516817253b32d21ef20bc43ac2b

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