Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a79453a70ad6573…

MALICIOUS

PDF

71.6 KB Created: 2021-06-12 06:56:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 2ce1b801e35faa4805f8febd504be29d SHA-1: 48ff1b7045d78cfa9201a5d7817bfd52ee52de42 SHA-256: 5a79453a70ad6573e93230cf975597faf413866fc4e9da9cdb65ffbe0637a55a
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm designed to distribute malicious content or phish users. ClamAV and ML classifiers strongly indicate maliciousness, and the embedded URLs suggest a phishing or content distribution attack pattern. No scripts were extracted, but the PDF structure itself is used to host and redirect to numerous external resources.

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
  • 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://crysiq.ru/pbw?utm_term=rhcsa+8+cheat+sheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4451545/normal_602667cde51c4.pdfIn PDF document text
    • https://damabinon.weebly.com/uploads/1/3/0/7/130738970/4e9d9a22061487.pdfIn PDF document text
    • https://nunigagajil.weebly.com/uploads/1/3/4/7/134751499/setipaju_puvoxasatalot_gekokujutaxe_dinudujonedugu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383460/normal_6055c7632a411.pdfIn PDF document text
    • https://waguwejulunesu.weebly.com/uploads/1/3/5/3/135301122/noxinigosasiza.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481836/normal_6000029dab18d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374857/normal_6009fb66c3052.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499319/normal_5fe979129d642.pdfIn PDF document text
    • https://tijisevivojo.weebly.com/uploads/1/3/4/5/134502531/letogabiku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403805/normal_60b7f00eea6e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415524/normal_603304cef2778.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424347/normal_60021c548cc7c.pdfIn PDF document text
    • https://cheatography.comIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xujaripusa.pbworks.com/f/97849574533.pdfIn PDF document text
    • http://wojoxevom.pbworks.com/w/file/fetch/144705750/chauffe_eau_equation_300l_notice.pdfIn PDF document text
    • http://ditatafomofu.pbworks.com/f/11155705601.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74162dc7-2ee9-48df-9f74-ce1a005d38f1/real_air_jordan_1_mid_smoke_grey.pdfIn PDF document text
    • http://gawalutibig.pbworks.com/f/download_xprofile_premium_apk.pdfIn PDF document text
    • http://lekuzax.pbworks.com/f/how_to_solve_mole_to_mole_problems.pdfIn PDF document text
    • http://xoxafepapesu.pbworks.com/f/32426737279.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3f372d8-7b29-4386-8ed2-8d11aefe7c64/suxuwukejiviwejitejotara.pdfIn PDF document text
    • http://tarogifere.pbworks.com/w/file/fetch/144723369/investment_valuation_damodaran_3rd_edition.pdfIn PDF document text
    • http://sejuworepow.pbworks.com/f/40206654620.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dabb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABB 4960 bytes
SHA-256: c731228ed60b5193dfcef9de062b80f42c69150fc22d90be6bd48770a9b4bfe6
font_01_sfnt_off0000eb97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB97 11164 bytes
SHA-256: 6b820ad78517d6efe73cb1e8409e789c3d982ea8f6ada01760e695899c5a1a6a