Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f7d1978e37f9a75…

MALICIOUS

PDF

87.7 KB Created: 2021-09-15 13:07:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 131856f316ec65f7ed57b5ea89f49436 SHA-1: 222845a69b16ea22415233fda1aff139b98f32d0 SHA-256: 1f7d1978e37f9a7528e95a393fd2e487c70e386f3872036277bd20024541d8f7
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, with numerous external URIs pointing to potentially malicious sites. The document body is heavily obfuscated, but the presence of many URLs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://catamma.ru/uplcv?utm_term=android+launch+app+on+boot
    • http://makrostal.pl/user_images/file/18096896959.pdf
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/13135674622.pdf
    • http://lezeckastenakosice.sk/upload/files/kojupadedafelusetozat.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614118835b110---komapetilijegiki.pdf
    • http://fuhua.tumujike.com/assets/upload/files/202109111544472673.pdf
    • https://sayurhijau.com/contents/files/tusaxex.pdf
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/mikatogenopojawogekosuxo.pdf
    • https://healthlantern.com/ckeditor/ckfinder/userfiles/files/29450214509.pdf
    • http://fgosvo.ru/files/files/2593532376.pdf
    • https://fototipia.hu/files/files/nirijerob.pdf
    • https://wrd13.com/force/file/tolukozubimunedovezidekis.pdf
    • https://dailyiat.com/html_upload/file/75911364865.pdf
    • http://itps-group.com/uploadfiles/file/dajarezibulefepowuladudip.pdf
    • http://fanghsin.com/uploads/files/202109040017592945.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161373f08cef39---mijopu.pdf
    • https://bulendengin.com/upload/ckfinder/files/76177850900.pdf
    • http://clinicaveterinariabilancino.it/userfiles/files/sifusaru.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/161416012112c4---sereroduba.pdf
    • http://drivingtesttips.ie/fckeditor/userfiles/file/62090268397.pdf
    • http://polins.org/public/userfiles/file/10787945235.pdf
    • https://bellcera.60km.com/upload/files/pufexakoxiwiwogadafes.pdf
    • http://gimnazjum-krasiczyn.pl/img/userfiles/file/tusaranesobuvizuve.pdf
    • http://stimatacasa.eu/userfiles/files/fatanuwituxomulemimimoxex.pdf
    • http://bsp-oblspl.org/ckfinder/userfiles/files/pakojuva.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f25c.bin
750437970bc35a6d31b54578aefe95d4e32f5ae6e4347c4a3cade0924f13c6bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF25C 18020 bytes
font_01_sfnt_off00012168.bin
f8f68357f672e78d12492944acd39bd17b4880215671ced55f319ad2d6a30c58		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12168 10532 bytes
font_02_sfnt_off0001390c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1390C 16792 bytes

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