Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8587b775148546b…

MALICIOUS

PDF

83.3 KB Created: 2021-03-13 16:40:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 15920ad954c529bc6f1b068aed059997 SHA-1: d9a4927e626a372064a25bc0316528af6910598a SHA-256: f8587b775148546b7fb14955211026f680a95de05a7b1fa7ffecd31480c55fc8
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm and by a machine learning classifier as malicious. It contains numerous external links, with one pointing to 'https://zajinet.ru/strik?utm_term=pedalera+digitech+rp80+precio', suggesting a phishing or SEO spam campaign. The document body is heavily obfuscated, but the presence of external links and the heuristic findings indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://zajinet.ru/strik?utm_term=pedalera+digitech+rp80+precio PDF link annotation
    • http://lemixop.iblogger.org/kelatopazebujemek.pdfIn PDF document text
    • https://levukuwaxumofet.weebly.com/uploads/1/3/1/3/131383949/kupowipenigerorurek.pdfIn PDF document text
    • https://xigogedamexov.weebly.com/uploads/1/3/1/3/131384098/ruwuvinut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383804/normal_5fe86cbfd4ff2.pdfIn PDF document text
    • https://torolanomopefi.weebly.com/uploads/1/3/0/7/130739669/0d7a75600cf1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387826/normal_600ca46f79af0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369332/normal_5fe135066bd60.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491451/normal_603d1d42609b1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fb023d0-9f97-432e-bad4-b8635b4d58f2/learn_c_programming_for_beginners_tutorial_point.pdfIn PDF document text
    • https://5ac9d038-517d-4536-97f6-676423289421.filesusr.com/ugd/b444d4_0eb63427165e4bc6ac96e95f1e2d6f76.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d8c6449-7a43-49f5-917c-abbb3dd97364/what_does_txt_stand_for_on_a_golf_cart.pdfIn PDF document text
    • https://9610c43f-1b2a-4a8a-b660-75aaf3908198.filesusr.com/ugd/286fb8_e8958011f7b24284b6550b89d51573db.pdf?index=trueIn PDF document text
    • https://3568c1c9-c281-4b9a-9ea9-d5d291e0176b.filesusr.com/ugd/e5d8db_e6721e3906874abb9237dd440cda1d19.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jukezeluf/fivis.pdfIn PDF document text
    • https://s3.amazonaws.com/nerugiraxura/finance_reporting_analyst_job_description.pdfIn PDF document text
    • http://juvumutat.rf.gd/can_you_replace_the_battery_in_a_seiko_kinetic_watch.pdfIn PDF document text
    • https://7211abc3-b26e-437e-abd8-8a8c7ebd4af5.filesusr.com/ugd/0683fb_fef287cc277541bfb3969a74ee6d5dfb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1a8ebb5-79f9-401f-b061-3566d7c51a91/24678859654.pdfIn PDF document text
    • https://s3.amazonaws.com/dosalapasenow/fifty_shades_freed_full_movie_watch_online_youtube.pdfIn PDF document text
    • http://sofiwige.rf.gd/komitukofelelugiku.pdfIn PDF document text
    • http://kirawolus.rf.gd/bally_bally_song_mp4_free.pdfIn PDF document text
    • https://ff9dba89-6132-4485-99c2-ace8a2453124.filesusr.com/ugd/c3f59f_8d41401057ac49069ff312d52fdfc6c2.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CE 5496 bytes
SHA-256: 703006ae842cadf6fb97259edb64f6fd2ed09ad107c82465b389932df1c161e2
font_01_sfnt_off00011777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11777 11848 bytes
SHA-256: dd396a6077e2c728857f13cf4845a8058a27bb86038a056cbd7e8d3fa2365e98