Malicious PDF — malware analysis report

Static analysis result for SHA-256 34cff1891779a73d…

MALICIOUS

PDF

82.7 KB Created: 2021-09-11 01:45:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9d6a26068b5e9edf0260726eebe9797c SHA-1: 401affa97bf24dda2da9a23f3b32462cc1ad80c1 SHA-256: 34cff1891779a73d67e1512ea7da116096cde4183a9a4a9db5697cadb94de2a7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the high ML score indicate malicious intent, likely to redirect users to phishing sites or download further malware. While no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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 http://nasfthr.com/userfiles/file/jafokuler.pdf In PDF document text
    • http://life-worldwide.org/assets/uploads/files/sigazarapasabikoju.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/divepagutesugozumeletofe.pdfIn PDF document text
    • https://cairparavel.ro/app/webroot/files/userfiles/files/14033314623.pdfIn PDF document text
    • http://thrifthelp.com/flash/thrifthelp.com/file/gajiguxikeda.pdfIn PDF document text
    • http://pantipplaza.com/userfiles/file/85245458723.pdfIn PDF document text
    • http://mweb.cz/images/file/bebonamegibogefodit.pdfIn PDF document text
    • https://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/mijanoveremavodakigaw.pdfIn PDF document text
    • http://otpetye.com/images/shared/file/96795576896.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/meneru.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/babelizosenede.pdfIn PDF document text
    • https://promaxsuspension.com/csmimage/file/97770885103.pdfIn PDF document text
    • http://honeystraw.com/uploadfiles/file/revari.pdfIn PDF document text
    • http://yujinpharma.com/upload/files/tamavebub.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/kitoxugugi.pdfIn PDF document text
    • https://nobelboya.com/userfiles/file/janajukoxusunobexikizuje.pdfIn PDF document text
    • http://yuha.be/_files/file/tidavufoxim.pdfIn PDF document text
    • https://bdata.vn/upload/files/15590530661.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a1114b607---41177224288.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210903092924118.pdfIn PDF document text
    • http://logenamerica.com/userfiles/file/jajuxoxavogapijupetaxu.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/84520765416.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/50116763840.pdfIn PDF document text
    • http://trungtamdaykem.vn/Images_upload/files/19977218879.pdfIn PDF document text
    • http://eventclub.pl/userfiles/file/35648944197.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=avatar+torrent+magnetPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF0F 22120 bytes
SHA-256: f51d5310220a1024f0b838077e4ad7fa71fb61bfd7994559e7ed80e4701b061e
font_01_sfnt_off0000f542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF542 16348 bytes
SHA-256: 8fcced7a8fcbf22d45689b44407ce1c1b45b78050135da208b7eeea4fc129b0d
font_02_sfnt_off00010bb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB5 10192 bytes
SHA-256: 6f0b301e47cf231ebbc83e7666e2a9aafbeed00becfa786bd902e3f760e36068
font_03_sfnt_off00012299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12299 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1