Malicious PDF — malware analysis report

Static analysis result for SHA-256 abfe19b7a3910816…

MALICIOUS

PDF

87.3 KB Created: 2021-05-18 05:49:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c31d1cd19363c56fdf5c61a56b562ffd SHA-1: d7f527762f070a93a47b4cb9abe969da6d6bf01b SHA-256: abfe19b7a3910816f4282ddd87123fbaa47f41a523871f036dc703041194837d
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • 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.
  • 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://fokemale.ru/strik?utm_term=what+are+ikea+kitchen+doors+made+of PDF link annotation
    • https://dapobatajixafaw.weebly.com/uploads/1/3/4/3/134310280/firukuxovezelajilajo.pdfIn PDF document text
    • http://faxadiweruxu.22web.org/72245507379.pdfIn PDF document text
    • https://jepuderakemuso.weebly.com/uploads/1/3/4/6/134666912/141bbccb96149.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379982/normal_5fea3f445bad9.pdfIn PDF document text
    • https://bipinudaw.weebly.com/uploads/1/3/4/7/134718108/2210136.pdfIn PDF document text
    • https://sexeduju.weebly.com/uploads/1/3/5/3/135327292/nunopuwo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457008/normal_6037a9ffe57ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473640/normal_6049f420e7876.pdfIn PDF document text
    • https://favaruzikab.weebly.com/uploads/1/3/4/8/134871436/semus_gakoxak_xafexalanipi_loxevimeziru.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417805/normal_600fb5bbed38c.pdfIn PDF document text
    • https://pogipusuzifu.weebly.com/uploads/1/3/4/8/134869227/baluwu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386613/normal_6066cfe8c7b99.pdfIn PDF document text
    • http://defeposakabap.iblogger.org/63293331128.pdfIn PDF document text
    • https://nodukuzizowuw.weebly.com/uploads/1/3/4/0/134000349/26b9c9f9b0e7b.pdfIn PDF document text
    • http://ramisur.22web.org/16508425411.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482407/normal_5fd6c994a921c.pdfIn PDF document text
    • https://xosotujusosevo.weebly.com/uploads/1/3/4/3/134377620/8794987.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464732/normal_5fe1423264ad6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446944/normal_6000c1c11ef6e.pdfIn PDF document text
    • https://gisogademumes.weebly.com/uploads/1/3/1/3/131379615/f6a0ec05.pdfIn PDF document text
    • http://pefujogori.iblogger.org/zupigin.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://s3.amazonaws.com/vazisi/heterotroph_and_autotroph_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/vavapekadoliti/z_black_remix_dj_narender_mahala.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxefemebidaz/97715116076.pdfIn PDF document text
    • https://s3.amazonaws.com/jitimesolagun/sufelitogifilodunodakojo.pdfIn PDF document text
    • https://s3.amazonaws.com/wufujudisu/describe_alluvial_soil_under_formation.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001083c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1083C 5092 bytes
SHA-256: 3f8b26ac57c04648d86c3eb95163e44298e14605c92110cede51ccacdc24be99
font_01_sfnt_off00011965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11965 11760 bytes
SHA-256: de19331a183525c4832deee52ffc7ba63d9849c657adc2e470897a7d093e2c3b
font_02_sfnt_off000140ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140AD 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c