Malicious PDF — malware analysis report

Static analysis result for SHA-256 00622e383d4d67eb…

MALICIOUS

PDF

81.8 KB Created: 2021-04-03 21:24:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 9897c37629489a00c69e7a387af61090 SHA-1: d5f4b46b2c67647c4033b196c01717bc682ac8ce SHA-256: 00622e383d4d67eba66ac2d5edb84ad9e9a39986e6971cdb3fc076c4d4df2104
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links to external PDFs hosted on disposable domains, indicating a link farm likely used for SEO manipulation or to distribute malicious content. The presence of a known malicious redirector URL and ClamAV detection further supports its malicious nature. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/award?keyword=aprendizajes+clave+primaria+tercer+grado+pdf In PDF document text
    • http://madalez.22web.org/93692167964.pdfIn PDF document text
    • https://gutamigev.weebly.com/uploads/1/3/1/1/131163772/fojasaru.pdfIn PDF document text
    • https://wesobopaforok.weebly.com/uploads/1/3/5/3/135311180/zasij.pdfIn PDF document text
    • https://xukotonaxi.weebly.com/uploads/1/3/1/4/131453431/zotibate.pdfIn PDF document text
    • https://cdn.sqhk.co/bulelovuroga/i2a4Spa/57977979302.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468259/normal_6002b885d23c5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405430/normal_5fe2bd91953ad.pdfIn PDF document text
    • https://dawopodesolapip.weebly.com/uploads/1/3/5/3/135327749/fc6aa1f.pdfIn PDF document text
    • http://vuzuvolumupapiz.22web.org/30135943568.pdfIn PDF document text
    • https://vagewojevibo.weebly.com/uploads/1/3/4/8/134873572/0cae10c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417997/normal_5fdae3c014cbb.pdfIn PDF document text
    • https://cdn.sqhk.co/dezorevukor/i6K4FgY/fifa_mobile_20_chemistry_guide.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387706/normal_5fee9a47bf542.pdfIn PDF document text
    • https://tosulabemolajeg.weebly.com/uploads/1/3/1/8/131871730/1400412.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://uploads.strikinglycdn.com/files/ef9d63d7-4799-4a7c-8c12-63a0d25732f5/the_great_hunt_grand_tour_review.pdfIn PDF document text
    • http://rijulewe.epizy.com/ayn_rand_philosophy_who_needs_it_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2298390b-b4d2-474e-a872-50433d7f1614/excel_2013_formulas_cheat_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4b8c1a6-ae19-4361-9bfa-1d3941fcb5be/luzabitedo.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d64d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD64D 6744 bytes
SHA-256: 048fb1891f432488516cd811e7b04d68e7d39e548ca3495625137f8fb0c23ff4
font_01_sfnt_off0000e732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE732 5436 bytes
SHA-256: 755eb11c39da9358b9803c0fe9d2a5ae617b95000c44eff5bd120a2dea3b43da
font_02_sfnt_off0000f99f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99F 2268 bytes
SHA-256: 7f38c7bd3076d5ec567b373f8788658f617417f44aeaffad1c2d563936ecbb0a
font_03_sfnt_off000103af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AF 11560 bytes
SHA-256: 9f90e3f5f34584175b7f555a66f7bb140e46f800701811a161dda2db6983bcff
font_04_sfnt_off00012960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12960 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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