Malicious PDF — malware analysis report

Static analysis result for SHA-256 e50a003dddc4a1e2…

MALICIOUS

PDF

77.5 KB Created: 2021-03-21 08:25:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 92f2a9b4e34a350415ea84f8eb80d8b8 SHA-1: 242b2d2ffa0e8cf0f6303376d168b97a9a10e29f SHA-256: e50a003dddc4a1e2529bb54bd3805c0182d878a3c1f62d2eb936d721cf48f813
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, embedding numerous external URLs, with one specifically identified as a potential phishing lure. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create SEO-optimized content or phishing pages.

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://resalured.ru/strik?utm_term=what+does+high+fertility+rate+mean PDF link annotation
    • http://silujokiz.mypressonline.com/forma_de_gobierno_de_venezuela_segun_la_constitucion_de_1999.pdfIn PDF document text
    • http://fonabibexame.iblogger.org/amana_microwave_amv2307pfs_parts.pdfIn PDF document text
    • http://rejuxipo.iblogger.org/zazasukemojiritekikufabe.pdfIn PDF document text
    • http://jedusajinud.mygamesonline.org/musegumemomufupif.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d5cf7a15-73c9-49c9-ad57-d4f0303abb0c.filesusr.com/ugd/0d002d_f6a64dc1ac544ee08aef5138e256615a.pdf?index=trueIn PDF document text
    • https://d2faa26e-66ca-44cd-8f84-883624a71019.filesusr.com/ugd/dbbfd0_b0a54812673942cab2cffce79cb2648f.pdf?index=trueIn PDF document text
    • https://46c0acaa-de7d-4f46-84f0-c2cf1d8ff7d9.filesusr.com/ugd/ac1638_4338496147104e4db49469bca98a9fa9.pdf?index=trueIn PDF document text
    • http://pibekolovaxizon.epizy.com/agriculture_images_hd.pdfIn PDF document text
    • http://vivubela.epizy.com/field_methods_in_archaeology_hester.pdfIn PDF document text
    • http://xidawowikobotof.rf.gd/bloodstained_game_guide.pdfIn PDF document text
    • http://tinafominur.epizy.com/65027775074.pdfIn PDF document text
    • http://lufapot.epizy.com/34951020540.pdfIn PDF document text
    • https://b7f5b04e-b247-49a4-9dc0-39f0c843ec09.filesusr.com/ugd/b56f86_ecb0933b72364b69a031d6ffe6a50109.pdf?index=trueIn PDF document text
    • https://6f8cb219-4830-455d-9ced-b55e65700e85.filesusr.com/ugd/fd30ac_03a3ae683b5e4f799bdda78d5cd4d400.pdf?index=trueIn PDF document text
    • https://43a98339-0465-49d0-a416-8cef4780896f.filesusr.com/ugd/89258f_fbb1390e56ad4a39b06e8559acab9b07.pdf?index=trueIn PDF document text
    • http://nojimaduxonariz.rf.gd/wopopigapetakamufote.pdfIn PDF document text
    • http://dukazaxotak.epizy.com/adobe_illustrator_7._0_free_softonic.pdfIn PDF document text
    • http://gosidopofabuv.epizy.com/protozoan_parasites_of_man.pdfIn PDF document text
    • https://7737876a-f762-42ef-af6f-18b78abacabf.filesusr.com/ugd/9066bd_68dc3510f7d04550b163949feb50a0df.pdf?index=trueIn PDF document text
    • http://savuxerekeze.epizy.com/the_ascent_of_money_episode_1_summary.pdfIn PDF document text
    • https://dd3528e8-ded0-4753-843e-0d3cb9f542e7.filesusr.com/ugd/4d6844_6f5d776230694de88c780b924c92550b.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_off0000efa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA5 5436 bytes
SHA-256: 49bbcf46ce36c5a7c17ded77597603c54afcefc5557d2af7ad22f414450507bd
font_01_sfnt_off0001020e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020E 10812 bytes
SHA-256: 6bbf272794b6a28d13851c4b116722de3fab9d174bda399938e378846588af7d