Malicious PDF — malware analysis report

Static analysis result for SHA-256 71ba7ada845c6302…

MALICIOUS

PDF

73.5 KB Created: 2021-09-23 11:08:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1b1cf50ad17b591f7789c6ed07638f59 SHA-1: 3c26cec64b4c20bc06798233e99222ebf103c816 SHA-256: 71ba7ada845c630241c82356d07550260b73905629122263bf16a1a48d6d487c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is a link farm on disposable hosting, and numerous external URIs were extracted, suggesting a phishing or malware distribution attempt. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://pixomot.ru/uplcv?utm_term=when+transporting+a+refrigerator+laying+down PDF link annotation
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/64853272745.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/xabujaladeruwu.pdfIn PDF document text
    • https://035620126.tw/upload/greenkitchen/files/64327632020.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/gerugo.pdfIn PDF document text
    • https://ancoraeducacion.com/images/60475903798.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/sotidiso.pdfIn PDF document text
    • http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/23716017843.pdfIn PDF document text
    • http://blekinge.boj.se/uploads/userfiles/files/81568658001.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb54ac63f5---papitokozukobekibomagew.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/90430030043.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1631406607.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/jexolig.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/67125411801.pdfIn PDF document text
    • https://belitour.ir/basefile/belitourir/files/98717582464.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/gimej.pdfIn PDF document text
    • https://santa.my/images/users/00000000/files/wakigorilapukositasebedev.pdfIn PDF document text
    • https://securitydm.net/slicice/file/84291654428.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614bdf905d1bf---buxegojogavigo.pdfIn PDF document text
    • https://maychieuvinh.vn/upload/files/95519150688.pdfIn PDF document text
    • http://amsuatrust.org/survey/userfiles/files/91809711117.pdfIn PDF document text
    • http://rm-centr.ru/uploads/file/sifotefixif.pdfIn 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_off0000c25c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC25C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA73 10968 bytes
SHA-256: a0035f47e7afe0d525c9054f4be9f3b10582712a69f4fb8b6c4e1497e8b8fdaa
font_02_sfnt_off0000f3b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B2 17368 bytes
SHA-256: 348d7226844aa0f911ad2cbfaba6f4daf49325bf9108688ca825138f666b5b27

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