Malicious PDF — malware analysis report

Static analysis result for SHA-256 48180c16dd50ecbc…

MALICIOUS

PDF

110.5 KB Created: 2021-01-30 09:36:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: c1fc6fd90a1b4b695cb47ffacf710048 SHA-1: e2407bec43631a8a1c87b737dabc04ab1fd45dc9 SHA-256: 48180c16dd50ecbc3632dfff54f92d0fc75d717a4b0685e4bdcf1e455fdb53ca
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content likely prompts the user to install a fake browser extension or update, a common social engineering tactic. ClamAV detection and ML classification confirm its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://seumenha.ru/123?utm_term=nevermore+rwby+chords PDF link annotation
    • https://kifesajisibak.weebly.com/uploads/1/3/4/8/134884742/zatidaxoveni_galonoxuso_mewawas_bokikas.pdfIn PDF document text
    • http://ch-bewertung-2888.xyz/derokav35007.pdfIn PDF document text
    • https://lelamibi.weebly.com/uploads/1/3/0/7/130738841/nefumizepa-gemebipemip-ginofebesu-nasudixaduv.pdfIn PDF document text
    • https://lebabipiw.weebly.com/uploads/1/3/0/9/130968925/4b40f9c.pdfIn PDF document text
    • https://zakuxaposud.weebly.com/uploads/1/3/1/3/131382531/revusona.pdfIn PDF document text
    • http://trikotoria.ru/aC59FkC4B1mC4B1n_beden_dilirjyt9.pdfIn PDF document text
    • http://ovca.space/nirapewetefodaxepokasupfbgq.pdfIn PDF document text
    • https://dojudetokin.weebly.com/uploads/1/3/4/6/134613144/8918515.pdfIn PDF document text
    • https://janososa.weebly.com/uploads/1/3/5/3/135326085/lowazanevik.pdfIn PDF document text
    • http://barashik.space/123_pattern_indicatorhstlt.pdfIn PDF document text
    • https://magirodimape.weebly.com/uploads/1/3/1/6/131637482/pudezajonide_wokefegomil.pdfIn PDF document text
    • https://wademaleg.weebly.com/uploads/1/3/5/3/135346716/259753.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://rigitusavogu.epizy.com/protein_synthesis_activity.pdfIn PDF document text
    • http://jugejojejaf.epizy.com/a_level_computer_science_revision_guide_ocr.pdfIn PDF document text
    • http://papujov.epizy.com/67976510944.pdfIn PDF document text
    • http://gefuxexo.epizy.com/5374375053.pdfIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/segregation_in_a_sentence_yahoo_answers.pdfIn PDF document text
    • http://vejawojifig.epizy.com/temiwifukuwujoso.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00016aa8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x16AA8 29368 bytes
SHA-256: f29497d607d76c748b6bc242f3f9d204a06bd7df09d754f87ee74e9f62da82a0
font_00_sfnt_off00013291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13291 4852 bytes
SHA-256: ef3b8183493efe110b9c25d22f64732a15d4bf5c2be3dcedd850b4dd93f716d1
font_01_sfnt_off0001431e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1431E 11496 bytes
SHA-256: def6d9e5a722888f56407e10181a82587aed031d732c583ace1e2773674faa5c
font_03_sfnt_off00019e91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19E91 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2