Malicious PDF — malware analysis report

Static analysis result for SHA-256 72606cf2cb6ff50b…

MALICIOUS

PDF

80.1 KB Created: 2021-03-10 11:07:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 6404d2e8c468c7122220f74f6e227360 SHA-1: bab908396fe2c4198e1b4380bbb2c956355a2571 SHA-256: 72606cf2cb6ff50b170b8056a1832c7d20f982d857992433bae39b571bbddce6
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a significant number of external links, with a notable heuristic identifying it as a "PDF_SEO_LINK_FARM" and "PDF_SEO_DISPOSABLE_LINK_FARM", suggesting an attempt to manipulate search engine results or redirect users to potentially harmful sites. The presence of URLs like 'seumenha.ru' and 'lnstagramcopyrightcenter.com' further supports this, as they are associated with malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://seumenha.ru/123?utm_term=drop+down+menu+in+excel+sheet PDF link annotation
    • http://lnstagramcopyrightcenter.com/ganunazowakaraeoujb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427506/normal_60149cb875822.pdfIn PDF document text
    • https://cdn.sqhk.co/gofelaxes/3jLpT1h/crackle_apple_tv_code.pdfIn PDF document text
    • https://tojewenegekov.weebly.com/uploads/1/3/4/5/134502344/foxewigavafewa_lugepolopanus_kexipotedetapo_sitesej.pdfIn PDF document text
    • https://nemanuvipiza.weebly.com/uploads/1/3/1/3/131398236/1451190.pdfIn PDF document text
    • https://cdn.sqhk.co/xerejijasoma/hR1jbhg/real_cricket_20_mod_apk_all_tournament_unlocked.pdfIn PDF document text
    • https://cdn.sqhk.co/ropikenetu/j3idgiA/condado_vanderbilt_hotel_beach.pdfIn PDF document text
    • https://cdn.sqhk.co/jebumujo/hdD2lia/glace_real_para_bolacha_receita.pdfIn PDF document text
    • http://momentshop.space/free_christmas_events_near_me_todayomuhs.pdfIn PDF document text
    • https://zeruposizagaki.weebly.com/uploads/1/3/4/8/134854722/3325916.pdfIn PDF document text
    • http://naturaleone.space/7126978948vt54.pdfIn PDF document text
    • http://silkhfig.bid/worst_superhero_fight_sceneslyt0p.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375209/normal_603e3a5d53738.pdfIn PDF document text
    • https://cdn.sqhk.co/sebutarukaw/VUUgcji/33351628927.pdfIn PDF document text
    • https://faxilazow.weebly.com/uploads/1/3/4/7/134725206/7042558.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://128fc002-9ed4-4a8f-9a6b-83b43563a9ed.filesusr.com/ugd/6812d7_6b170cc6aed245c2ac847a9e2fd52eda.pdf?index=trueIn PDF document text
    • https://45b0b119-5f8c-43e7-b437-4e12d17c1c81.filesusr.com/ugd/3826db_130fb8eb6b044b64ab02ef55d015f67e.pdf?index=trueIn PDF document text
    • https://eb40363d-1d1f-4170-a897-f23f0f433116.filesusr.com/ugd/2a1429_5b36855aee3d447598dedabbc994a79d.pdf?index=trueIn PDF document text
    • https://d4f4546a-a836-4b3d-8651-c56b89608eca.filesusr.com/ugd/3e9e83_4fa0931309334d13b0cd67712b47ebcd.pdf?index=trueIn PDF document text
    • https://933afb0c-60ca-4ff4-ba38-e7c804ca925d.filesusr.com/ugd/941881_70515564f1274bf294715bebc1e5bb32.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/77990edd-a4ca-4d05-a2d7-b6ec53970ba7/48848028364.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ff72309-0ed7-41e5-ba66-7aacc9f56e62/lipaluvufezefofe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67e7326c-cdd3-4abd-9c9c-3a2df3031d26/98414731508.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eaaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAA 5144 bytes
SHA-256: 9a75fe7643be7c7b49b37d43142f53a3df927ca75347fd394f3b5ecfdbc0a37b
font_01_sfnt_off0000fc10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC10 11452 bytes
SHA-256: c2515ad02d7b3f31b0e0b41ff2c1ac2cb024da731a1dc6193b1ae901225fe4a1
font_02_sfnt_off0001235d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1235D 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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