Malicious PDF — malware analysis report

Static analysis result for SHA-256 29b10519a8205cb6…

MALICIOUS

PDF

71.2 KB Created: 2021-10-03 02:25:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1ecca7f846390250bda2a1f7e6059d76 SHA-1: 7eda1b104213cf4a42b0b330390064db6e39d38e SHA-256: 29b10519a8205cb6fc753b4f6e7b705dbd82e0abf8e452d2360a405f0b8dce8c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate a strong likelihood of phishing or malware distribution. The sample's structure and numerous external links suggest it is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://philabc.ru/uplcv?utm_term=the+integumentary+system+is+composed+of+skin+hair+and+nails PDF link annotation
    • http://t-eamplus.de/web/editor/files/63933821655.pdfIn PDF document text
    • https://searchlink.org/userfiles/file/28210071442.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/bigudepafitiveduwumusewa.pdfIn PDF document text
    • https://jobtiara.com/files/files/lovatiwotosaro.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614277b4d435b---41335285344.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/19756150148.pdfIn PDF document text
    • https://dichvumoinoi.com/ckfinder/userfiles/files/39566429853.pdfIn PDF document text
    • http://forti.in/userfiles/file/mowavenanujawufigaxatip.pdfIn PDF document text
    • http://airfa.it/userfiles/file/93896017507.pdfIn PDF document text
    • http://duplisite.com/userfiles/file/pajomogabegulim.pdfIn PDF document text
    • http://propack-th.com/image/upload/File/45863079736.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/rajugudawe.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/88020763030.pdfIn PDF document text
    • http://chinahongji.com/d/files/tirazajapewonugosisevib.pdfIn PDF document text
    • http://baominhlabors.com/upload/files/nozukefifazepadalemi.pdfIn PDF document text
    • https://mimpishio2.com/contents/files/fovijapopakazuf.pdfIn PDF document text
    • https://mavibusiness.it/file/zezeduminixera.pdfIn PDF document text
    • http://joltiy.ru/uploads/files/tewowukuvojavilotadura.pdfIn PDF document text
    • http://pure-chiral.com/upload/files/16849532829.pdfIn PDF document text
    • http://fishngrill.iorderfoods.com/uploads/files/mamixeb.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/13710739423.pdfIn PDF document text
    • http://walosports.cl/userfiles/file/53352528055.pdfIn PDF document text
    • http://opusbiz.kr/data/editor/file/5272413116155f007cc6a2.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16158da3273002---45933223027.pdfIn PDF document text
    • http://dc-3ed4d7413bdb.prshots.de/uploads/userfiles/1630973252/files/64060021316.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_off0000b3c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBDA 11336 bytes
SHA-256: 0afa1ea0411ad68c05e4c9471aa917d09a709c992b7d4052250c877e7e0f4c2b
font_02_sfnt_off0000e62c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62C 15836 bytes
SHA-256: c6175f0c6c243f420448dd5b2da3814f45236adf9dea51fd1c0ad95f715e78bc