Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6faef9ddb4cd87e…

MALICIOUS

PDF

80.4 KB Created: 2021-10-07 02:04:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 188b06c104ad9a55e08226d3ffe37797 SHA-1: 9bd36e210ee446f58ebba91336f1239827f557c8 SHA-256: d6faef9ddb4cd87e75e289145a93abd5bf82692f2e442150068c73eadd648313
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are hosted on disposable domains and utilize UTM parameters, strongly suggesting a phishing or link-farming operation. The ML classifier and ClamAV detection confirm its malicious nature, classifying it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs indicate an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://catamma.ru/uplcv?utm_term=images+of+earth+day+2021 PDF link annotation
    • http://pm-property.pl/userfiles/file/davifawijuv.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/fujowuwaxagutaniwirugu.pdfIn PDF document text
    • http://wwsm-us.com/files/file/lekugilazokifajozu.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/fewigozomaxazaxilomuro.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/donojikarozerutisow.pdfIn PDF document text
    • http://eko-uklid.com/files/file/97587625647.pdfIn PDF document text
    • http://an-ocn.ru/ckfinder/userfiles/files/pexevitarudi.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/kfvho1sccghovsg30m03vcvvhp/57874687963.pdfIn PDF document text
    • https://laptopserwis.com/app/webroot/media/files/73444093410.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/jasitavabuk.pdfIn PDF document text
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/pazagotopuximedaxiza.pdfIn PDF document text
    • http://harnettcountyhba.com/userfiles/file/rosegeripeke.pdfIn PDF document text
    • http://orthodoxvaidikasanghom.org/userfiles/file/mijajuset.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/49879429396.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/24272406665.pdfIn PDF document text
    • http://ginzaoakland.com/uploads/files/xopuritufapejip.pdfIn PDF document text
    • http://teplospectr.ru/images/files/59380986370.pdfIn PDF document text
    • http://sunway.me/uploads/file/271447278700.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/foxetugitusotuwebiwe.pdfIn PDF document text
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/lizimir.pdfIn PDF document text
    • http://techbico.vn/uploads/image/files/19183276716.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/korojutitipovebiw.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_off0000cd05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD05 10920 bytes
SHA-256: 6b4ff0a606d00944a83b33ee2eced90af5f995651ac34b55f44f26c8e1568f4c
font_01_sfnt_off0000e649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE649 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5B 19716 bytes
SHA-256: 8994b0b4eb000301d03c53d39a6750210a1a711cae93b601ca6a55c7f31b3b5b

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