Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb037871fffd663d…

MALICIOUS

PDF

83.0 KB Created: 2021-09-12 22:58:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 129d0ec3c44840229acf21670ed695d5 SHA-1: 109b7093007a3fb83e4b540c85c8d50859525adb SHA-256: cb037871fffd663d36608e88e8cbe0672d9ded2eb7c80ee64a16cb4345b4e5cb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malware distribution scheme. The file's structure and the presence of external URIs suggest it is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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=how+to+delete+history+on+droid PDF link annotation
    • http://iccjsc.com/images/uploads/files/mepekudefiwukiled.pdfIn PDF document text
    • https://ostrichpharmaceuticals.com/userfiles/file/81698152112.pdfIn PDF document text
    • http://instalater-macecek.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/superude.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/35337046238.pdfIn PDF document text
    • https://gadesign52.com/uploads/files/202109060855525628.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/49697373941.pdfIn PDF document text
    • http://ruihuitax.com/files/file/wivovetuzegefisowifes.pdfIn PDF document text
    • https://sausalito.com/wysiwygfiles/file/91296872930.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/36866172766.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0a3d2524d---xavanav.pdfIn PDF document text
    • https://allora-tour.by/var/upload/file/komese.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/31538284700.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/pukigaposeru.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/medizugogemo.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/20219800128946.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/gazoduvapujunifiloje.pdfIn PDF document text
    • http://highlevel.pl/userfiles/file/kagawigakewedalap.pdfIn PDF document text
    • https://processwork.archerhuang.com/ConImg/files/katarebojizeroseti.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/85439495578.pdfIn PDF document text
    • https://mauspro.net/upload/files/9047733260.pdfIn PDF document text
    • http://oreoltour.ru/sites/default/files/file/68845376804.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/zomepafibo.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210910181020.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_off0000e03d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03D 18260 bytes
SHA-256: 163679bf3f829f4b7840e0c7cc41feb2179b667bcc447cee947c436f60256a76
font_01_sfnt_off00010ef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001270f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1270F 10372 bytes
SHA-256: 96e63bba5635da06b7a9002aaff5f2b5c21a3c1da9fb7ad0ca589d9293f2d0ab

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