Malicious PDF — malware analysis report

Static analysis result for SHA-256 561e9f2928637860…

MALICIOUS

PDF

74.3 KB Created: 2021-10-01 03:14:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 80628959883878a225340f37d40f5c0a SHA-1: f4f71226fcb411323a5c6ea368694851146b9bc8 SHA-256: 561e9f29286378602b8325c3b33c44bb2a52ad227430e2c74dc649e424457dd3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs further supports the attack pattern of luring users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://laborke.ru/uplcv?utm_term=aggiornamento+software+samsung+s2+plus
    • http://motolargo.pl/userfiles/file/81338965965.pdf
    • http://sapthagireesyathra.srikarpagavinayagamills.com/userfiles/file/kajurojopobolojude.pdf
    • http://myphamvickwhitebeck.vn/luutru/files/daruseritosajijuvixadefog.pdf
    • http://lasfyy.com/uploadfile/file/20210922170041482.pdf
    • http://deccanquest.com/konadnew/userfiles/file/nodosozelegutani.pdf
    • https://toptenstudy.com/upload/files/BodyFile__613DFA7546BF8.pdf
    • http://seidels-mineralienwelt.de/images/uploaded/file/36453420105.pdf
    • http://khyljg.com/uploadfiles/files/turogiselarukoxi.pdf
    • http://avtokit116.ru/!upload/files/memenemupip.pdf
    • http://colonia-hausmeister.de/uploads/files/podulipegivekabafovov.pdf
    • http://bumsnab.ru/uploads/files/wifemubopunizoradifatud.pdf
    • http://apsencollege.org/test/fckeditor/file/tulaxafivifikepusezojat.pdf
    • http://agriturismolionsfarm.it/userfiles/files/sobefevo.pdf
    • http://zhfangyuan.com/uploadfiles/files/zupirawobulefek.pdf
    • https://lekkermooi.nl/userfiles/file/jivexasinovulepezus.pdf
    • http://n2nnetworks.com/files/others/57318737960.pdf
    • https://alicantea.centralcms.cloud/galeria/files/zojoxagipoba.pdf
    • https://www.jakketoes.be/ckfinder/userfiles/files/zowebilutagepunifibe.pdf
    • http://ipost.mn/ckfinder/userfiles/files/83640858208.pdf
    • https://armature.ir/cache/fck_files/file/31060120234.pdf
    • http://stellarp.com/userfiles/files/18891310638.pdf
    • http://yearbookplus.com/uploads/ckfinder/files/39531677822.pdf
    • https://livre-art.com/ckfinder/userfiles/files/27964106473.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_off0000b8a1.bin
3e66b576d28215db448a30d84196b4ac6926776cfc07854c46292e10df3aa914		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB8A1 18824 bytes
font_01_sfnt_off0000ea09.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA09 16792 bytes
font_02_sfnt_off00010220.bin
56d929640a3ce020efaee4207785c8d30f7ae84159af627820dabcdeca1f50d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10220 10988 bytes

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