Malicious PDF — malware analysis report

Static analysis result for SHA-256 f96bbf2c6bf98f43…

MALICIOUS

PDF

82.4 KB Created: 2021-09-24 06:48:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6155014a63d81421f995d3a891139a30 SHA-1: effc433fd2b9d81cc89551907e998fee2a64da5e SHA-256: f96bbf2c6bf98f431e11866de605c128aee0e6db820bb1fcc3200b895a6cbaef
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains numerous external URIs pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, identifying the document as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://smidgel.ru/uplcv?utm_term=metronome+tempo+apk PDF link annotation
    • https://brincandoeaprendendo.com/fotosempresa/files/tumuragudugebosegupisezu.pdfIn PDF document text
    • http://bftt.marketsearching.com/upload/files/65028495178.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/31115275969.pdfIn PDF document text
    • http://hagelkonzept.com/userfiles/file/nidiviweribawowuvigim.pdfIn PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/tulefewig.pdfIn PDF document text
    • https://viceda.com/userfiles/file/rilivenotukodaviv.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/94348013706.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d410fb1a53---96064763893.pdfIn PDF document text
    • http://contrast.no/ckfinder/userfiles/files/72054282589.pdfIn PDF document text
    • https://oferta.lt/i/File/febugamedenugepukiwiwa.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1613d02f7eb741---97238546677.pdfIn PDF document text
    • http://ruizhishengwu.com/uploadfiles/file/171643296329.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/gozurizixeruw.pdfIn PDF document text
    • https://creativetalentnetwork.com/ckfinder/userfiles/files/16005377277.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/33679642605.pdfIn PDF document text
    • http://bacsionline.net/userfiles/file/98367185682.pdfIn PDF document text
    • http://ruizhishengwu.com/uploadfiles/file/170945383592.pdfIn PDF document text
    • http://ipoz.pl/userfiles/file/87562271524.pdfIn PDF document text
    • http://inggeo.eu/userfiles/files/retexibetaki.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/12858062394.pdfIn PDF document text
    • http://dekobonner.de/userfiles/file/73666486035.pdfIn PDF document text
    • https://t2sc.me/userfiles/pekaganotiwixufega.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/molasonibukinikekaluxo.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210901_125132.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_off0000dc43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f45a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45A 10192 bytes
SHA-256: f34b1bc7a62cc46b27f1c897a07908e3b6223462f3ad026c2e8c97f489b58087
font_02_sfnt_off00010b27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B27 18836 bytes
SHA-256: 45f1d7042c16660e1a185938d278b09207952ca39b852e27dce15eec525c4cfc

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