Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cc36405c20d4d49…

MALICIOUS

PDF

78.4 KB Created: 2021-03-19 10:23:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b6b86127e179aad81ea1a67ff486bcef SHA-1: b1ea29d20f415cfc10a5a0d42c785aaae04ec397 SHA-256: 3cc36405c20d4d49343015a17070b43f21562571cead04b350c56d050d5348b3
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically as a phishing or trojan delivery mechanism. While no scripts were explicitly extracted, the presence of numerous external URLs points to an attack pattern involving directing users to potentially malicious content hosted elsewhere.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/aws?utm_term=is+vital+choice+worth+it
    • https://static.s123-cdn-static.com/uploads/4485703/normal_5fd0741eba8fa.pdf
    • http://linefofaxugedu.mywebcommunity.org/manevev.pdf
    • https://lidukawovov.weebly.com/uploads/1/3/5/3/135323160/jugidavigadifolidil.pdf
    • https://zokevuwokonumez.weebly.com/uploads/1/3/4/6/134682223/61f282a9c831eb.pdf
    • https://static.s123-cdn-static.com/uploads/4390074/normal_5feb5d54aaa4d.pdf
    • http://tezuveripoxub.mypressonline.com/hamilton_beach_breakfast_sandwich_maker_with_timer_-_dark_gray_25478_shop_all_hamilton_beach.pdf
    • https://cdn-cms.f-static.net/uploads/4423443/normal_605420ab69cbf.pdf
    • https://cdn-cms.f-static.net/uploads/4407988/normal_603e98377ede5.pdf
    • https://zokemubolito.weebly.com/uploads/1/3/4/8/134895641/09eceb668a8a3.pdf
    • https://static.s123-cdn-static.com/uploads/4459175/normal_5fe4ebab35a61.pdf
    • https://static.s123-cdn-static.com/uploads/4416919/normal_5fdcc066b2d5e.pdf
    • https://static.s123-cdn-static.com/uploads/4451556/normal_5fe4d8ecadb4e.pdf
    • https://gomamuna.weebly.com/uploads/1/3/5/3/135304292/talut_lizopanizij.pdf
    • https://gavebinakufir.weebly.com/uploads/1/3/2/3/132302735/karemeloxeteke_vamugugu_satakox_jotobisuteka.pdf
    • https://cdn-cms.f-static.net/uploads/4420430/normal_602ff83801dbd.pdf
    • https://static.s123-cdn-static.com/uploads/4366045/normal_5fc9cc1519263.pdf
    • http://suzamajotibe.mywebcommunity.org/94514825999.pdf
    • http://wupemokabate.scienceontheweb.net/demande_d_attestation_de_travail.pdf
    • https://kixakusafi.weebly.com/uploads/1/3/4/8/134891224/385fedaf.pdf
    • https://cdn-cms.f-static.net/uploads/4424637/normal_6040b160b5de4.pdf
    • https://zawanudodulir.weebly.com/uploads/1/3/1/4/131452903/85b03ffdb0fe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://04934832-22f3-474e-96de-b9d593e92251.filesusr.com/ugd/f390e7_f498d5f9ce3c4271b67bbaf7bf9dcce8.pdf?index=true
    • https://76df98a8-3e94-4eee-a6f5-23e1de06049b.filesusr.com/ugd/54c74c_b91b66850dfd42b6925cb1ff932ac7b8.pdf?index=true
    • https://e6f9d1db-9bad-45ba-a188-0e8e378e8087.filesusr.com/ugd/99b222_b0550d679e114da5aabf6f4a3d852ef4.pdf?index=true
    • https://2a4065d7-883d-43e8-a524-7ce9aa4b4e88.filesusr.com/ugd/ccb1c6_c554fe0d42504217bf63724c13ecb88e.pdf?index=true
    • 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_off0000f6fd.bin
09b41c56b8ca597a5189b3369271aee14252733f8e321c5e1323f1008363b5b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FD 4976 bytes
font_01_sfnt_off000107fb.bin
fcd27f0067ad70b3571b47a66b1fcc9b61ce2c4d6b8a19da983d09a51eb61eec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107FB 10636 bytes

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