Malicious PDF — malware analysis report

Static analysis result for SHA-256 803e8600391370bb…

MALICIOUS

PDF

116.4 KB Created: 2021-05-13 06:15:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 02dcf43761fe2c51932d343941c0e7e0 SHA-1: 8089d962af2dddf55152f0835093cd31afa06111 SHA-256: 803e8600391370bbe9fbae1c4180236f3fc82fbc03810aeec9ed354532dd5649
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, exhibiting characteristics of a link farm. It contains numerous external links, including one pointing to 'druttle.ru', suggesting an attempt to redirect users to potentially harmful content. The document's structure and embedded links indicate a phishing or malware distribution attempt, likely leveraging a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/strik?utm_term=application+of+digital+signal+processing+in+electrical+power+engineering PDF link annotation
    • https://cdn.sqhk.co/sujubowip/jzjgceV/22160366725.pdfIn PDF document text
    • https://dolilifiwu.weebly.com/uploads/1/3/4/4/134401054/965393.pdfIn PDF document text
    • https://cdn.sqhk.co/xewafazuk/odhjdhj/fonts_for_instagram_app.pdfIn PDF document text
    • https://taxesewisozigif.weebly.com/uploads/1/3/5/3/135394589/15f469.pdfIn PDF document text
    • http://bulubuzigajuzar.getenjoyment.net/encyclopedia_of_mathematics_james_tanton.pdfIn PDF document text
    • https://cdn.sqhk.co/bamebuxi/ijh9Zif/kukijaxakebudaxidu.pdfIn PDF document text
    • https://wozizagozesa.weebly.com/uploads/1/3/4/8/134848764/jelemubusebogirur.pdfIn PDF document text
    • https://cdn.sqhk.co/nulusezitelo/dCA3Dji/samajujago.pdfIn PDF document text
    • https://siganagimub.weebly.com/uploads/1/3/2/6/132683357/didopanupuzukotuj.pdfIn PDF document text
    • https://cdn.sqhk.co/bulixanejad/u7ioOib/33443182972.pdfIn PDF document text
    • https://cdn.sqhk.co/zamikukodef/gjMARCF/rental_bond_lodgement_form_victoria.pdfIn PDF document text
    • https://cdn.sqhk.co/dawadetugas/jPhgCjf/44367304201.pdfIn PDF document text
    • https://cdn.sqhk.co/fagaxirupunu/jdO1iiS/parsec_download_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5b0e1d79-1acc-45ba-a965-31015372eee8.filesusr.com/ugd/67f5f7_9afc862cf87446ccb77072514c00859c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gopuze/travel_magazine_template_wordpress.pdfIn PDF document text
    • http://tevefetilojas.atwebpages.com/xebedimiteberudenuf.pdfIn PDF document text
    • https://s3.amazonaws.com/jewizopukuni/how_fossils_are_formed_worksheet_ks1.pdfIn PDF document text
    • https://c751e6e8-0850-424d-b14e-d7ae46260796.filesusr.com/ugd/bc1028_7f10af68fb514a8c84f3364ebc273f34.pdf?index=trueIn PDF document text
    • https://00407fa8-a9ef-4b78-9bbe-46147fc8acf6.filesusr.com/ugd/5ecadc_5956b228d97345df917739b0b547c75e.pdf?index=trueIn PDF document text
    • http://fidegaf.atwebpages.com/afcat_2_2020_notification.pdfIn PDF document text
    • https://97a45c9e-1ab5-462a-bfe2-fded34b9a8b9.filesusr.com/ugd/b50c55_d88c188e28fa44a1979f1d3bdc2ed4ac.pdf?index=trueIn PDF document text
    • http://bifiwapaz.onlinewebshop.net/plate_tectonics_crossword_puzzle_answer_key_1-26.pdfIn PDF document text
    • http://pudolajuji.atwebpages.com/19155291235.pdfIn PDF document text
    • https://24d1f61b-f5c5-4d2f-8180-62589f44e8d8.filesusr.com/ugd/eed56f_e1b0c8d00dae42aca4fc4454f054d089.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016e97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E97 5404 bytes
SHA-256: 32ee82e159bf7d6caad8a396ff61d1bf805598fb74f0ad117ed0c3fdfca2c4b2
font_01_sfnt_off0001811c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1811C 13276 bytes
SHA-256: 7f48de814534e688076e1a8b85c63ac0dd443b24c12b2ab04cf7c78e5a362c4e
font_02_sfnt_off0001ad94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AD94 16060 bytes
SHA-256: 84d5bd19c210eb3b73ecc14096ab1e56fdfb5b80ce7ba4f0052c67c0c2b02727

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