Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bb8bd55b61dcdde…

MALICIOUS

PDF

83.1 KB Created: 2021-09-19 13:21:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b961b75222ee43f5e531ce727637a587 SHA-1: db2f49093e8d71635982ed1f1d713ddbf2a8817c SHA-256: 3bb8bd55b61dcdde510b83de631dbb1472d210890baee1fd4b74af22002725d4
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, with one specifically identified as part of a link farm designed to redirect users. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic to obscure the true destination or distribute malware through a network of compromised or malicious sites. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://laborke.ru/uplcv?utm_term=fluid+simulation+free+apk PDF link annotation
    • http://tunesistudio.eu/userfiles/files/49954026238.pdfIn PDF document text
    • http://borneneskontor-landsforening.dk/userfiles/file/kapiw.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/bojuvisepi.pdfIn PDF document text
    • http://villa-margherita.biz/userfiles/files/xuzipoditixak.pdfIn PDF document text
    • http://calisnt.com/uploads/files/xetemujazibinokifokavo.pdfIn PDF document text
    • http://aviafond.ru/userfiles/file/44038353999.pdfIn PDF document text
    • http://exdebt.bg/userfiles/file/wutalagimufudoj.pdfIn PDF document text
    • https://lighthousemacau.com/html_upload/file/79905963301.pdfIn PDF document text
    • http://abwbaltimore.com/uploads/files/31927879316.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/fatosef.pdfIn PDF document text
    • http://bouwbedrijfansing.nl/userfiles/file/77034708175.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/45700578576.pdfIn PDF document text
    • https://cnn-logistics.com/asset/files/pilajuwodipofinigubuzizeb.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/jusafesu.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/58d92haqtsbo9b4eln8i9favq2/37452030380.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/sesujekijote.pdfIn PDF document text
    • https://panoramabyty.cz/content/xoserazavogamote.pdfIn PDF document text
    • http://elsped.hu/files/file/tinurulipowij.pdfIn PDF document text
    • https://dhesient.com/media/84834749503.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/17277660438.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/raxavofazasopuvogu.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/91468721829.pdfIn PDF document text
    • http://trinitysportsandleisure.ie/userfiles/file/38370718440.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d8bda4d72---jipos.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/14856426795.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_off0000e16d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16D 10828 bytes
SHA-256: 8c253a33784d78a2fcb81251e67701b54731e13a4f999f9d7ff5e9c448395c74
font_01_sfnt_off0000fa59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA59 17184 bytes
SHA-256: 6fb736a1ad7d9453cea75aaaf38dd1bf4c4325029f19fcc63b698b2d294554ea
font_02_sfnt_off000126ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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