Malicious PDF — malware analysis report

Static analysis result for SHA-256 caa50c5e96a92040…

MALICIOUS

PDF

86.4 KB Created: 2021-05-12 08:00:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: f91d35f2a17b5f03bce87e19c91b7453 SHA-1: e85baed1e07657ca7030976b7b1b69a403d9357d SHA-256: caa50c5e96a9204093ccd7ffbf884a73dd2f09b218d20548270afd8bbdcbe002
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://nipisod.ru/strik?utm_term=how+to+live+healthy+lifestyle+essay PDF link annotation
    • http://tokio-2020.fun/what_are_the_stages_of_sensorimotor_developmentc9zmx.pdfIn PDF document text
    • http://zerkalo-fugicar.website/tecnologa_de_las_centrales_termoelctricas_convencionalesawh6q.pdfIn PDF document text
    • http://premium-cinema.com/24329424651o04nv.pdfIn PDF document text
    • http://curvepreloved.com/age_of_empires_2_conquerors_no_cd_crack88tvd.pdfIn PDF document text
    • http://arthromedshop.xyz/spaghetti_in_a_hot_dog_bun_lesson_ideasmlecs.pdfIn PDF document text
    • http://gatorama.site/bitacora_de_obra_formato_excelzz1ql.pdfIn PDF document text
    • http://sis-paypal.com/najemiferirasaeip53.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/xapijifas/black_colour_hd_background.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/tazojaziranoget.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b649802b-8d65-4351-a469-08f2297235f3/lezajadobobodevupul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69d271d6-3f31-4229-b1a9-ee68232411c3/76329654118.pdfIn PDF document text
    • https://91ca87c2-c493-4616-adaa-fbcec45394e1.filesusr.com/ugd/6116da_4f38f08a7ac34dc6abb21a7107bef2a6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c86d362c-c110-455a-9a32-7e5fe071374a/sexofabilamadosadobu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f64ea872-799a-45d4-a4ca-3740412fac89/wuruvosizotabowazow.pdfIn PDF document text
    • https://acaa17bf-cf2e-4132-a9e9-810271eb8bc4.filesusr.com/ugd/ab5b4c_ac26fe8a91754614a5c22606b849e4da.pdf?index=trueIn PDF document text
    • https://39c1d623-eccb-4af0-a86a-15328a2d61f9.filesusr.com/ugd/3cb6cb_796f45a5264849be940f334a8c35e7cd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sazariwapa/i_am_a_man_lyrics_black_strobe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5293f05-381d-41c5-8149-ddecff796cdb/85705119350.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f8ee340-1a93-4e8f-820f-c18c6875e0d6/what_is_a_causal_chain_in_english.pdfIn PDF document text
    • https://s3.amazonaws.com/ratixifo/33431806256.pdfIn PDF document text
    • https://s3.amazonaws.com/timeziso/8399698950.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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AD 4656 bytes
SHA-256: 2e88c5fe99a90106761b9aee38befd6a21adbffb96c01b5c9671c3d4c4290ea7
font_01_sfnt_off000101a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A5 11516 bytes
SHA-256: fb573076ea01f5470648e3e6cdf1a086651f9176627740c433258c28194dc09e
font_02_sfnt_off000128f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F7 16060 bytes
SHA-256: d1a84ba8f0e4a827a048d387db8dd5dae3538f1c7e72415b16af587a9947cdc7
font_03_sfnt_off00013d8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D8F 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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