Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f6f44edfc60b4c5…

MALICIOUS

PDF

78.3 KB Created: 2021-05-23 18:48:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aaec3d88aac9cbdc3556f842c313b0cf SHA-1: 643a7b5517646f931de8a199e8cef19bf622ff12 SHA-256: 6f6f44edfc60b4c55937b670c86efce185708ab88ca952cb4d1350701c133a77
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or phishing campaign. The heuristic 'PDF_SEO_LINK_FARM' and the presence of a URL with 'yahoo+mail+send+read+receipt' in its query parameters strongly indicate a phishing lure. ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment. No scripts were extracted, but the PDF structure itself facilitates the attack.

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/strik?utm_term=yahoo+mail+send+read+receipt
    • https://jokasagumejede.weebly.com/uploads/1/3/1/0/131070006/8015673.pdf
    • https://jumegelizo.weebly.com/uploads/1/3/4/7/134712838/zepewubitak.pdf
    • https://buketopol.weebly.com/uploads/1/3/4/0/134013372/23315b8.pdf
    • https://static.s123-cdn-static.com/uploads/4370780/normal_5fecb01530e4d.pdf
    • https://rawekawus.weebly.com/uploads/1/3/4/4/134467784/wigatubekadufo.pdf
    • https://wopufibirebosaw.weebly.com/uploads/1/3/4/4/134466277/sikebubibakano.pdf
    • https://rejukikigukaw.weebly.com/uploads/1/3/5/3/135387704/3a7488eaea149c.pdf
    • https://static.s123-cdn-static.com/uploads/4495395/normal_6001ec1d1975a.pdf
    • https://cdn-cms.f-static.net/uploads/4445550/normal_602575db5560e.pdf
    • https://viwalamul.weebly.com/uploads/1/3/3/9/133997630/191900.pdf
    • https://gagetagij.weebly.com/uploads/1/3/2/6/132695244/8295233.pdf
    • https://static.s123-cdn-static.com/uploads/4405186/normal_6000c0992f0e8.pdf
    • https://static.s123-cdn-static.com/uploads/4476577/normal_5ff2bc4dc5767.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/1def385d-ab11-4570-80d9-587bd0eaa56b/what_is_the_meaning_behind_the_raven.pdf
    • https://uploads.strikinglycdn.com/files/95e01b80-1228-4f9f-9a0a-501f1811b274/call_of_cthulhu_7th_edition_keeper_rulebook_free.pdf
    • https://uploads.strikinglycdn.com/files/cac2078b-3611-4c7a-b86f-e99672078f4c/diamond_razor_edge_bow_manual.pdf
    • https://uploads.strikinglycdn.com/files/de0145e6-71cd-411b-821d-c1c6508763dc/59242399034.pdf
    • https://uploads.strikinglycdn.com/files/18e3f9f3-0d21-4947-9fe4-565f11060d24/36346382607.pdf
    • https://uploads.strikinglycdn.com/files/837db48e-f7f8-47c3-8537-e0184bdc6304/miwilom.pdf
    • https://uploads.strikinglycdn.com/files/523c4c01-fce9-46b6-9908-0aa46af61215/what_is_the_best_survival_kit.pdf
    • https://uploads.strikinglycdn.com/files/b9b40371-0067-46e6-8a02-651f127c9ca6/hp_elitedesk_800_g1_sff_drivers_windows_8.1_64_bit.pdf
    • https://uploads.strikinglycdn.com/files/22b3e3dd-0532-4ef7-ae92-9d244be48d0c/rpg_maker_mv_tutorial_for_beginners.pdf
    • https://uploads.strikinglycdn.com/files/f838418c-3f8a-422f-91de-8a88b4b9aa22/how_to_search_using_images_in_mobile.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea20.bin
53a09271225a5210f10b37d76bfe8e24c691b505613eb1af743151a795a6fecb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA20 5060 bytes
font_01_sfnt_off0000fb23.bin
d5a215ea9de36077dd4dec4b053897cd661064c98986f6ca452ddcc38f3c5e04		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB23 10124 bytes
font_02_sfnt_off00011dd5.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD5 4324 bytes

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