Malicious PDF — malware analysis report

Static analysis result for SHA-256 d407a27f3bbd9353…

MALICIOUS

PDF

115.6 KB Created: 2021-04-23 01:57:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 828fb3a06e42e7924b050e37b64b8b8f SHA-1: 9b9c179aa30bcd5914e32a07f1c78e2f27e43bbb SHA-256: d407a27f3bbd9353d1b340d38945371d407337dcecc0d699aaa52f38e23fe234
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 0.9987

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://baarspo.ru/strik?utm_term=which+is+the+top+model+of+innova PDF link annotation
    • https://cdn.sqhk.co/jobebakegip/d1ha11x/likee_video_downloader_no_watermark.pdfIn PDF document text
    • http://ovca.space/majexeki4zx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499999/normal_6055826b2a8ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491688/normal_6041fe52a2b41.pdfIn PDF document text
    • https://cdn.sqhk.co/kukelagalefe/gidQVij/mac_os_x_movie_manager_alternatives.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486997/normal_6066d92bb2a4b.pdfIn PDF document text
    • https://cdn.sqhk.co/wugolekufo/Ighjdjj/ping_pong_rules_ball_hits_net.pdfIn PDF document text
    • http://bellissimo.online/bigarag9aium.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387920/normal_6064e2fa98ea0.pdfIn PDF document text
    • https://cdn.sqhk.co/kaxonavi/8JOvst0/65071111937.pdfIn PDF document text
    • http://my-favshoph.online/barycentre_trianglew7clo.pdfIn PDF document text
    • https://cdn.sqhk.co/dajebala/PhjEhgK/43494290558.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482863/normal_606a762061b0e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471686/normal_6002ac364382d.pdfIn PDF document text
    • http://seviregigaguz.22web.org/i_m_an_albatross_song_320kbps.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495526/normal_5fe4a9a206e24.pdfIn PDF document text
    • http://batut.space/80931566271hr5qh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475383/normal_5fdc16b948104.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://cf62593c-3f62-494e-9ef9-3c2a63ead7d7.filesusr.com/ugd/93dae2_cc665c32fa46440daf0d8667caf49c8b.pdf?index=trueIn PDF document text
    • https://2a082fd4-e93f-4b8e-9e59-408fa046b31c.filesusr.com/ugd/e334dd_bfe713d70976413b84042537435d9904.pdf?index=trueIn PDF document text
    • http://zidimuzizofobe.rf.gd/artichoke_s_heart_suzanne_supplee.pdfIn PDF document text
    • http://vuzudaru.epizy.com/pakat.pdfIn PDF document text
    • https://bff5fdab-9fd0-4670-908b-a1308bb5a9cb.filesusr.com/ugd/227d0f_259f5d94087b409387f76d929868894b.pdf?index=trueIn PDF document text
    • https://8d59741e-369e-44be-b01e-8fbcb09d2d01.filesusr.com/ugd/7cefa9_c3ea0ca1b435463eacb4e4e8bdbf71ca.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15133 5372 bytes
SHA-256: a6f5a34e70b5e520bba04abc74c1792753b025979d251883db6ab03fc832d31a
font_01_sfnt_off00016360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16360 11300 bytes
SHA-256: 42fc1c05e63cfadcc5f1e36bf9c185a1ebd8becbe62c5bbebed3aa575fa6c321
font_02_sfnt_off00018325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18325 12332 bytes
SHA-256: 7d03117bd109ed0c7b278da17a50df0e69a2e80e06ed50cccdb6da2931ab9f89
font_03_sfnt_off0001ab65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB65 16060 bytes
SHA-256: 2d958bd008b8db5b33092f112e99c856adbcc0a100e950d14ff814b784be6357