Malicious PDF — malware analysis report

Static analysis result for SHA-256 d44eb8578c010f2b…

MALICIOUS

PDF

138.1 KB Created: 2021-03-17 04:40:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 71ec1dff47e548b626c811fcb81318d2 SHA-1: 178d0bbd262cf1609190a99d3a40f48c06a06af5 SHA-256: d44eb8578c010f2b1b50778465d7b835e455ff6b34d5261876d0133e4ad848fb
126 Risk Score

Malware Insights

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

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 0.9928

Heuristics 5

  • 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 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://dafemum.ru/wix?keyword=dragonvale+gem+hack+reddit PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403413/normal_6010119a2fa03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501645/normal_602712b2220d9.pdfIn PDF document text
    • http://wivevemeb.scienceontheweb.net/jofedadisixafatuzarukox.pdfIn PDF document text
    • http://teachost.com/reglas_del_memorama_en_inglesn3xm9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478932/normal_60114a7c11f9a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371003/normal_5ffbde5413267.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418184/normal_5fd96ac2b6f15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425737/normal_601585344cbf5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378605/normal_604840d22d3d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410194/normal_601ce90fa133d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461746/normal_600ba93331b66.pdfIn PDF document text
    • http://bestrongbyg.com/49646011004de3r8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466659/normal_5fcaf627b78f8.pdfIn PDF document text
    • http://praktika-ingenieur.com/zojuzulerifosojapoojnuj.pdfIn PDF document text
    • http://neo-tp.ru/luwipurezupominekeke3j0pm.pdfIn PDF document text
    • http://musc-media.xyz/kuvotiwoz9q5tc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fidobakipivogit/ti_nspire_calculator_case.pdfIn PDF document text
    • http://bebovufuvuji.myartsonline.com/le_petit_prince_summary_french.pdfIn PDF document text
    • http://ranitirunom.myartsonline.com/rotemavujegodesasimejisok.pdfIn PDF document text
    • https://s3.amazonaws.com/wizuluworafid/huckleberry_finn_chapter_20-25_summary.pdfIn PDF document text
    • http://jagomizaf.atwebpages.com/kowigel.pdfIn PDF document text
    • http://lofunadex.myartsonline.com/rifamogifovimabexetumi.pdfIn PDF document text
    • https://s3.amazonaws.com/widuxade/22787386934.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019e8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19E8D 3136 bytes
SHA-256: da9227d803687063f66cf7dfa78de1ee905a540eef857ffc4d92688b8418ee34
font_01_sfnt_off0001a9b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A9B9 5300 bytes
SHA-256: 60e7cbfc5f21c8470130d6f9f2e28e9ffda2ac8870d4e196affdc74bc6c54586
font_02_sfnt_off0001bb97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BB97 7148 bytes
SHA-256: 5b06ee0e4b0cca975ac7fed39b04679311c0bd0bef42d8ea5516e3ae65e72aec
font_03_sfnt_off0001d457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D457 14400 bytes
SHA-256: db57744cf69b9d1d6350b9da9edf0ef5a7f8dc5cc8ae0a0a3af76d939cfd9f2a
font_04_sfnt_off0002031a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2031A 16468 bytes
SHA-256: e6a6af829791fe7420eae3d6b77f6328b6620274c43271cdb90982837dc4c050