Malicious PDF — malware analysis report

Static analysis result for SHA-256 8222cb5ee7d2eff2…

MALICIOUS

PDF

77.2 KB Created: 2021-06-01 14:58:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d842e9fc5a55fb3ba48896301c476ee0 SHA-1: d5b2517a172013ad2fa1b63f1304674524c11fa4 SHA-256: 8222cb5ee7d2eff2de8dc6b3d41af5a6b9814fa69360f96affd9026d73bed2d3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. The PDF document body is heavily obfuscated and appears to be junk data, further supporting the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/123?utm_term=h.+lundbeck+annual+report
    • https://senesawepemij.weebly.com/uploads/1/3/7/5/137503152/zojezu.pdf
    • https://molesomux.weebly.com/uploads/1/3/2/6/132681378/6040938.pdf
    • https://cdn-cms.f-static.net/uploads/4462341/normal_6013123e19a4d.pdf
    • https://static.s123-cdn-static.com/uploads/4413851/normal_5ff17ab000bdd.pdf
    • https://dijideloduxez.weebly.com/uploads/1/3/4/3/134362038/4604734.pdf
    • https://neninilez.weebly.com/uploads/1/3/3/9/133986457/3339167.pdf
    • https://gaparomid.weebly.com/uploads/1/3/4/6/134632142/xidobedib.pdf
    • https://cdn-cms.f-static.net/uploads/4419451/normal_6038fa2b004d3.pdf
    • https://cdn-cms.f-static.net/uploads/4450636/normal_605f59ae88b45.pdf
    • https://cdn-cms.f-static.net/uploads/4481406/normal_5fd3783514686.pdf
    • https://static.s123-cdn-static.com/uploads/4469641/normal_5ff524bfb521e.pdf
    • https://lazogipinu.weebly.com/uploads/1/3/1/0/131069887/6692543.pdf
    • https://pukelubaluwo.weebly.com/uploads/1/3/4/7/134741361/zibak.pdf
    • https://cdn-cms.f-static.net/uploads/4407314/normal_6051b2e722d86.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/19d5b6cd-d1e8-4d2d-aaca-6f95efa1a57e/51989078194.pdf
    • http://pazimonofe.pbworks.com/f/ghatna_chakra_books_free_download.pdf
    • http://ruwomodanom.pbworks.com/w/file/fetch/144461193/90939660347.pdf
    • http://bojirakaj.pbworks.com/w/file/fetch/144424938/rajasthan_patrika_news_paper_today_in_hindi_barmer.pdf
    • https://uploads.strikinglycdn.com/files/e5ef2d0a-7328-4e43-af17-c936dceed814/68552430402.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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed9c.bin
707403389febda23274bf238b49b6a20dbb25aebaf7d1fe0147e0ccbf92705ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED9C 5084 bytes
font_01_sfnt_off0000fef2.bin
c4c9b7a262fa1d52d4a120947974ee54a5bcab271abf641f8d14dab4b47af483		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF2 12420 bytes

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