Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d8d4390756b6f69…

MALICIOUS

PDF

86.1 KB Created: 2021-05-27 10:22:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b92c05bb6aa43e689c9dfcd03cd6e780 SHA-1: ba0435cc868c22ed623b632f10e5767bbce97efa SHA-256: 4d8d4390756b6f699ebdd28e0189f15f539b928cff15f4bf7623c6bd01cd115e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDFs, suggesting a link farm or redirection scheme. The primary URL, https://jumiwimov.ru/strik, is likely the entry point for this scheme. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jumiwimov.ru/strik?utm_term=what+factors+caused+the+industrial+revolution+to+start+in+europe
    • https://cdn-cms.f-static.net/uploads/4374198/normal_602bff2edcfba.pdf
    • https://japapitamamevoj.weebly.com/uploads/1/3/2/7/132740309/wuvor_takofozaseroxir.pdf
    • https://cdn-cms.f-static.net/uploads/4367625/normal_6054f82a98cc3.pdf
    • https://poxovoxi.weebly.com/uploads/1/3/5/3/135398301/1283259.pdf
    • https://static.s123-cdn-static.com/uploads/4478670/normal_5fcf4346a2cbf.pdf
    • https://cdn-cms.f-static.net/uploads/4413456/normal_6013ad08b574e.pdf
    • https://zodebosamu.weebly.com/uploads/1/3/4/4/134444592/1269ec.pdf
    • https://static.s123-cdn-static.com/uploads/4406456/normal_5fcb239ced692.pdf
    • https://cdn-cms.f-static.net/uploads/4455639/normal_6031699e1275f.pdf
    • https://static.s123-cdn-static.com/uploads/4497685/normal_5fc7e128da4f9.pdf
    • https://roxobirunuj.weebly.com/uploads/1/3/4/0/134096027/e1ea4ca56852.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/eed015b0-897c-4f4f-aad9-de8c1c312f55/dovatagoraduxozik.pdf
    • https://uploads.strikinglycdn.com/files/0deaa38c-d4e2-4596-86b7-b39a3711b648/kufukaravalepelabe.pdf
    • https://uploads.strikinglycdn.com/files/dcd820cf-10c3-4373-b538-24a5df07ee1a/what_bulb_goes_in_a_garage_door_opener.pdf
    • https://uploads.strikinglycdn.com/files/5e6fffa7-32ce-43da-b81d-52639dcd0fc0/86773458442.pdf
    • https://uploads.strikinglycdn.com/files/e62ff43d-1f3f-4ebb-8fb2-3ed7ce50d775/how_to_make_thinkorswim_real_time.pdf
    • https://uploads.strikinglycdn.com/files/4154bc63-f2d1-4cba-bfd3-1631abc519d8/full_focus_planner.pdf
    • https://uploads.strikinglycdn.com/files/15ac454d-0433-4d0a-861f-8c62b6d51fab/epson_wf-2530_manual.pdf
    • https://uploads.strikinglycdn.com/files/5a7e04f7-97b6-4953-9a79-90d5b6a3d71a/ohio_algebra_1_end_of_course_exam.pdf
    • https://uploads.strikinglycdn.com/files/d0b9449a-06e4-4168-9f1f-63a34b6ccbf4/ver_nuevo_rico_nuevo_pobre_captulos_completos_gratis.pdf
    • https://uploads.strikinglycdn.com/files/025e5176-5593-41d0-8e81-ae416211841b/sentence_structure_in_spanish_versus_english.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fdc1.bin
5dad2c38934dab319e17b45a5a4463a07fd9ff9bc1b68cc91d6e791283e6af26
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC1 5316 bytes
font_01_sfnt_off00010fe7.bin
3a96d61dc67bc8391c0b175cdfd3ff6982563003915cdec052e5f596ac8d7bce
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE7 11004 bytes
font_02_sfnt_off000135a5.bin
d1a84ba8f0e4a827a048d387db8dd5dae3538f1c7e72415b16af587a9947cdc7
pdf-font-stream PDF embedded font (sfnt) at offset 0x135A5 16060 bytes