Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dcfa00dc4aabfac…

MALICIOUS

PDF

76.6 KB Created: 2021-03-15 05:46:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 803c7cef7cb26420babd68b1aae5493a SHA-1: e2ce95c4b64dceb3d6d17ddba6d47ab2f94d0e46 SHA-256: 1dcfa00dc4aabfac278608faff9504bac19c203dee566a66310858dc152d82ed
164 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to 'nipisod.ru', which is associated with a link farm heuristic. The ML classifier and ClamAV detection strongly indicate maliciousness. Although no scripts were explicitly extracted, the PDF structure and embedded URI suggest it's designed to redirect users to a malicious site, likely for phishing or malware distribution, aligning with the 'Spearphishing Attachment' technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wix?keyword=unblocked+games+tyrone+minecraft
    • https://cdn-cms.f-static.net/uploads/4460449/normal_602ac03018311.pdf
    • https://cdn.sqhk.co/sobetevod/ihcgcih/dwellings_of_eldervale.pdf
    • https://cdn-cms.f-static.net/uploads/4383300/normal_6029524c69797.pdf
    • https://cdn-cms.f-static.net/uploads/4367951/normal_604d315b72fb0.pdf
    • https://cdn.sqhk.co/wepunajexiju/hbie8md/nissan_gtr_wallpaper_phone_4k.pdf
    • http://vittorguxx.site/la_biblia_de_liderazgo_de_maxwellhzz7l.pdf
    • https://bipixexomalexu.weebly.com/uploads/1/3/4/3/134349320/cda6090.pdf
    • https://cdn-cms.f-static.net/uploads/4496005/normal_600a98a620a87.pdf
    • https://bemesamug.weebly.com/uploads/1/3/4/7/134722017/5585792.pdf
    • https://cdn-cms.f-static.net/uploads/4427526/normal_60335ae840d9e.pdf
    • https://cdn.sqhk.co/kerutadit/ijZhegf/61651539525.pdf
    • http://hookup682.site/88000445617ja0zd.pdf
    • https://pirovosarelivo.weebly.com/uploads/1/3/1/4/131406751/0842d00.pdf
    • https://lijepaxo.weebly.com/uploads/1/3/5/3/135324298/wajurezoxi.pdf
    • https://cdn.sqhk.co/pubusudes/dhgsXji/baseball_vs_zombies_return_mod_apk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9db11cd7-eac9-4363-bbf3-d9063510aa7a/what_is_human_resources_management_all_about.pdf
    • https://uploads.strikinglycdn.com/files/3519129b-91e1-4cc9-a81a-68a0ed34b321/sisalinajarapedosexedivop.pdf
    • https://uploads.strikinglycdn.com/files/db7a837d-ec72-4f5e-ad79-136a8855e99e/readers_digest_fix_it_yourself_manual.pdf
    • https://uploads.strikinglycdn.com/files/5627053b-9af6-4e51-a428-411c681107a2/what_is_a_seasonal_worker.pdf
    • https://uploads.strikinglycdn.com/files/2bfc9440-4fc9-4da5-8b9c-b170d09528a4/6630242644.pdf
    • https://uploads.strikinglycdn.com/files/f4776e24-295e-460a-921d-b343a4bd6a75/fapowisozetinajemotemubo.pdf
    • https://uploads.strikinglycdn.com/files/073b5933-c4dc-428a-b6a2-63888cdda625/pezuvijagaxesemuv.pdf
    • https://uploads.strikinglycdn.com/files/6a0b2028-20a0-44d3-b2b0-56432bc575dc/reveille_for_radicals.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_off0000ee64.bin
73361c3810224a4a583296b1417848cea6784df733bd94d8f397cefbaf5b29c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE64 5640 bytes
font_01_sfnt_off00010192.bin
b2f34b573c6fca53499d2d42f79c227f0d68c6a730efdbf9a8df2f0b01715265		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10192 10596 bytes

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