Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0e85a78a3019530…

MALICIOUS

PDF

78.6 KB Created: 2021-03-09 16:52:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 1306231f962d734180b4abfe0dac9738 SHA-1: 40835e5b37a47bca3ff80b6af7ff293311fcebf4 SHA-256: a0e85a78a3019530a3845b3657cdd0507a7012e72e670f91267397b15f93fdc9
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting an SEO spam or link farm operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, but the PDF structure itself is used to host and redirect to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/123?utm_term=financial+statement+template+word+uk PDF link annotation
    • https://pasojifet.weebly.com/uploads/1/3/0/7/130776368/8314138.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475219/normal_5fe462791579b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380854/normal_5fd7bfe629a8c.pdfIn PDF document text
    • http://dojemop.mywebcommunity.org/27160973088.pdfIn PDF document text
    • http://raifaisentgo.online/tulajujevesugadev55twr.pdfIn PDF document text
    • https://fazerirusabutef.weebly.com/uploads/1/3/1/3/131381144/vowunikaxo_xibarelo_zaxof_fenaz.pdfIn PDF document text
    • http://lnstagram-copyright-supports.com/mijiwefepumofedebamixolafflhoz.pdfIn PDF document text
    • http://noverst.xyz/art_wallpaper_hd_zedge_iphone785lk.pdfIn PDF document text
    • http://prod-fruit.space/belirurunaxuwinexuxafekith3m03.pdfIn PDF document text
    • https://buvonage.weebly.com/uploads/1/3/0/9/130969236/65d26fc404.pdfIn PDF document text
    • https://zivogozupitis.weebly.com/uploads/1/3/1/4/131406352/jefemiravisafavafip.pdfIn PDF document text
    • http://viniveba.mywebcommunity.org/is_26_old_for_a_horse.pdfIn PDF document text
    • https://disamaro.weebly.com/uploads/1/3/4/6/134697064/gukodetugim-sagal-goburuxigur-xebejapezizad.pdfIn PDF document text
    • http://lipazegeboludep.sportsontheweb.net/ridikukagujedap.pdfIn PDF document text
    • http://lbaranaydin.com/fejenawoxoviwavapex3iur.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
    • http://laxufazekez.atwebpages.com/presto_pressure_cooker_409a.pdfIn PDF document text
    • http://vogexigup.rf.gd/embryonic_stem_cell_therapy.pdfIn PDF document text
    • http://zepedijuva.epizy.com/bluetooth_video_full_hd.pdfIn PDF document text
    • https://e966359d-176b-477a-9ad9-c314bea94227.filesusr.com/ugd/fa6f14_8ade3b463a68483eb42b56568da89732.pdf?index=trueIn PDF document text
    • https://abee6ad4-cf47-459a-954e-22b9b9bb30ad.filesusr.com/ugd/4bdc6d_cea1a0d2d4034c2483f7a95a87dc4ac3.pdf?index=trueIn PDF document text
    • https://dc58184e-bbba-402a-8e08-a55d552c8f3f.filesusr.com/ugd/0ebc1f_2e4c2bc482c248cf93a0699ee1f5088a.pdf?index=trueIn 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_off0000e95e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95E 5212 bytes
SHA-256: 7eb1c03255a93088d2c1acf1fd98f02f6235637dc356215f3c86d3d20db7a557
font_01_sfnt_off0000fb02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB02 10608 bytes
SHA-256: d7cb0e7351bda4dc9201d6bec996be4736be5743d44cd673fb932938ae0ec750
font_02_sfnt_off00011f0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F0B 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3