Malicious PDF — malware analysis report

Static analysis result for SHA-256 74870137a2d51600…

MALICIOUS

PDF

81.9 KB Created: 2021-10-05 20:50:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0cf14242d11125ea4550a457f09c594b SHA-1: 34ef89e67c0fac0d6f9d467e03be91a19271b94b SHA-256: 74870137a2d51600a8778f552dfe7938d862855d56ac7652a14c65f06f8a88a8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as Pdf.Phishing.Trojan. The presence of numerous external URIs, many hosted on disposable domains, strongly suggests a phishing or malware distribution campaign. The PDF's structure and embedded links indicate it's intended to redirect users to malicious content.

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://allytemp.ru/uplcv?utm_term=gate+food+technology+previous+papers
    • https://www.cosanuesa.com/componentes/editor/ckfinder/userfiles/files/xowozew.pdf
    • http://ventensis.lt/public/ckfinder/userfiles/files/7451833506.pdf
    • http://luatsugiadinhviet.com/upload/ck/files/33237817267.pdf
    • https://sicurezzaips.it/uploads/file/80995083049.pdf
    • https://keongracun.org/contents/files/48518845213.pdf
    • http://baschin-heizung.de/meineBilderAlbertGrundschule/file/vexirarukovarodorurumib.pdf
    • http://igabana.com/upfolder/e/files/20211001233437.pdf
    • http://apsencollege.org/test/fckeditor/file/jazubiz.pdf
    • https://takarasushimn.com/userfiles/files/zurikilebokumilid.pdf
    • https://granitnet.hu/editor_up/pirevakozan.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615ba512b3607---50886244693.pdf
    • https://designclarf.it/file/dafumelejoxosisulu.pdf
    • http://vencedor.coop/images/admin/file/tagaruxoditigozewikisi.pdf
    • http://erodiertechnik-wenzel.de/userfiles/file/29744404528.pdf
    • http://moderncarrent.com/user_img/files/38903635114.pdf
    • http://bodemveenweiden.nl/bodem-veenweiden-img/nemonasizilosojegapajagan.pdf
    • https://telliogluhukuk.com/userfiles/file/31291971147.pdf
    • http://top-rubber.com/admin/fckeditor/editor/filemanager/connectors/upload/file/dabajifisux.pdf
    • http://boxshop.mn/userfiles/files/zuwezobubij.pdf
    • http://kotrackusa.com/fckedit_file/file///20210901_22_52_4.pdf
    • https://safarekhoob.ir/basefile/safarekhoobir/files/kimubisi.pdf
    • https://newshieldinsurance.com/demo/gsa/final/images/file/4341861990.pdf
    • http://elturo.ru/img/upload/files/89493213649.pdf
    • https://ambalatender.com/upload/files/12192222390.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_off0000d31e.bin
a8db4d1455aadc7bb0fa958d147d82f3c6436c1dbb67afbc106cb7edcd656e6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD31E 20168 bytes
font_01_sfnt_off000107f1.bin
815389dfebaae4bec4772ddfa98db5eb0425cf98d3412c639d4b68f8fd815b7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107F1 11216 bytes
font_02_sfnt_off00012207.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12207 16792 bytes

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