Malicious PDF — malware analysis report

Static analysis result for SHA-256 88e5c79323cfbbde…

MALICIOUS

PDF

82.5 KB Created: 2021-09-23 03:28:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 76c4f35e921eff5258fb7e9b21477f42 SHA-1: b85c3fdcb921f5e1165484d3c7cb01e3c8453fbe SHA-256: 88e5c79323cfbbde2d66d7eaedc9712215cae2a6e5847f15c5ff1d08ca785660
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, with numerous external URIs pointing to various domains. The embedded URLs suggest a phishing or malware distribution scheme, likely aiming to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://queure.ru/uplcv?utm_term=how+to+reset+data+on+android PDF link annotation
    • http://goang-hann.com/uploads/files/202109020635312785.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/62797021088.pdfIn PDF document text
    • https://dukupahit.com/contents/files/9193738086.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/zojisojejapabomu.pdfIn PDF document text
    • http://sb-78.ru/files/file/67615903855.pdfIn PDF document text
    • http://rm-centr.ru/uploads/file/27713813132.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sobijusuw.pdfIn PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zinorito.pdfIn PDF document text
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/nisosavarejej.pdfIn PDF document text
    • https://maggievanostrand.com/uploads/media/file/54964433995.pdfIn PDF document text
    • https://hsiaoying.com/userfiles/file/galurimuneditidovifomevun.pdfIn PDF document text
    • https://granitnet.hu/editor_up/susevup.pdfIn PDF document text
    • https://dananeye.com/uploads/files/202109130131433671.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/757rust7o844l3lhkvlq6vjo8f/80771397647.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/nogaloxogotevokowubolegam.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/koteduvusuvagexasuzejewi.pdfIn PDF document text
    • http://www.hausbaumesse.at/ckfinder/userfiles/files/pekux.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1614a17068f249---37816531508.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/33787784865.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/87484229656.pdfIn PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/torapetigozolas.pdfIn PDF document text
    • http://mcserpenti.com/userfiles/file/87315444295.pdfIn PDF document text
    • http://020tzs.com/baige/images/userfiles/file/gegar.pdfIn PDF document text
    • https://kimcert.net/E/file/4396042420.pdfIn PDF document text
    • http://pizzeriagiganti.ro/imagini_ws/63297659836.pdfIn PDF document text
    • 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_off0000dd35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f54c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54C 10272 bytes
SHA-256: 43765963c29fcdb0e29ea75a512b175408e99136700f208ebde538ff39c5857d
font_02_sfnt_off00010c90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C90 18580 bytes
SHA-256: aeb0c4abcdb617abd9d1a9535686ec279662eac76b4082e394b5b42137d6f62d

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