Malicious PDF — malware analysis report

Static analysis result for SHA-256 268decb5e2d488e1…

MALICIOUS

PDF

76.6 KB Created: 2021-04-05 05:35:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 0b08af5ba4226c8bf7e4563152a4bdff SHA-1: 5bc2424f3fc8959a78117efa1b417931f6abdcb4 SHA-256: 268decb5e2d488e155d6accc965ed76fbdaf8503cc2ef8ab1cd3480875743ecc
166 Risk Score

Malware Insights

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

This PDF file is classified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains multiple embedded URLs, with a specific heuristic flagging an invisible link to 'http://securityofusersdevicesonline.site/jejolipazejo329sx.pdf' as a suspicious lure. The PDF also exhibits characteristics of a link farm on disposable hosting, suggesting an attempt to distribute further malicious content or phish for information. The presence of these elements strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://xezojetit.ru/award?keyword=data+communication+and+networking+pdf+free+download+tutorialspoint PDF link annotation
    • http://idem-peshkom.ru/fleabag_script_play9c49s.pdfIn PDF document text
    • http://cozyplacefor.rest/85557501209htfr5.pdfIn PDF document text
    • http://securityofusersdevicesonline.site/jejolipazejo329sx.pdfIn PDF document text
    • http://kyponnik.online/17057645147diye3.pdfIn PDF document text
    • http://flowerport.market/business_administration_and_finance_burlington_booksmjf1y.pdfIn PDF document text
    • http://dithetsen.xyz/5252149404hr2nq.pdfIn PDF document text
    • http://xplaintome.ru/elementos_finales_de_controlz44xs.pdfIn PDF document text
    • http://tublitalia.fun/186441842564czvk.pdfIn PDF document text
    • http://mists.space/chemistry_hydrate_lab_report27z5g.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8fc58a2e-a183-4186-a39c-c7ccdc1e23d5.filesusr.com/ugd/a298ce_ed25da09a3354c2a9340a2e2858f8607.pdf?index=trueIn PDF document text
    • https://964beff5-d24f-450a-94e2-fa7e9faef44a.filesusr.com/ugd/61158f_c354f13dcd5c403f98dcf0f57749c1ba.pdf?index=trueIn PDF document text
    • https://45dcde1a-aed5-4138-b95e-a0f768a283bf.filesusr.com/ugd/89441e_719520b2a8794302b30804f958f399b7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c869c41-0aae-41e8-b26e-407c8e516dd7/gadujanalebupixubefidiram.pdfIn PDF document text
    • https://e86c6366-0652-46cb-9e1f-5633a133dba9.filesusr.com/ugd/510a18_13f1a73ebc31436f8ecc33559493cd51.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wixatax/how_is_heaven_described_in_the_bible.pdfIn PDF document text
    • https://s3.amazonaws.com/jadere/what_does_carbon-14_dating_mean_in_science.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/rejig.pdfIn PDF document text
    • https://551f0ad2-75d1-4009-b90b-2f3e3e20230b.filesusr.com/ugd/c2bf0a_aaec328b34db453a8beab745241dbb34.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/07bc8fcb-095c-4845-9c06-afba67d47a54/ropifesoxedow.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ece2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE2 5632 bytes
SHA-256: ddd2994b83b9bd3d35725f8c5235882755d0bc9efa6da9c7f28b94000b004e33
font_01_sfnt_off00010018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10018 10760 bytes
SHA-256: 7360f049c912f8bd6d7def057ce3ca47c75997e50e44dfe7cba5ccd7db8a0508

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