Malicious PDF — malware analysis report

Static analysis result for SHA-256 db2845d659d34910…

MALICIOUS

PDF

76.3 KB Created: 2021-03-22 13:02:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d80cd6bcbfe484bc2d75ef3841b86288 SHA-1: aed8a8f3a66bcfd688783a345933bd456152cacf SHA-256: db2845d659d3491098fd90fdec099cb171524c687d5e23b93f08ed44c9faf556
196 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many of which point to SEO-optimized PDF files, suggesting a link farm or redirector strategy. One prominent URL, https://resalured.ru/strik?utm_term=silver+eyes+fnaf+characters, appears to be a redirector leading to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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=silver+eyes+fnaf+characters PDF link annotation
    • http://vemiwegar.iblogger.org/708958494.pdfIn PDF document text
    • http://rajizaloka.iblogger.org/what_is_not_considered_a_computing_innovation.pdfIn PDF document text
    • https://cdn.sqhk.co/gubisagebuto/wibLtTU/rudulef.pdfIn PDF document text
    • https://cdn.sqhk.co/dabozijide/njhH5jc/spongebob_krusty_cook_off_cheat_apk.pdfIn PDF document text
    • http://fullhp.info/38320891365td7ae.pdfIn PDF document text
    • https://kakifimetuwojo.weebly.com/uploads/1/3/4/3/134317364/gimasokal.pdfIn PDF document text
    • https://cdn.sqhk.co/mugegiduveb/70ijghU/noirmoutier_meaning_in_french.pdfIn PDF document text
    • http://pukepel.22web.org/princeton_review_sat_literature_subject_test.pdfIn PDF document text
    • http://vashmaster.info/3266787626gily7.pdfIn PDF document text
    • https://karinerojefemof.weebly.com/uploads/1/3/0/7/130775135/ddb29985da43.pdfIn PDF document text
    • http://choosemadam.site/rakutiribovurevevuxujagit32sih.pdfIn PDF document text
    • http://sumusevazig.22web.org/87037257073.pdfIn PDF document text
    • https://sibotapitagota.weebly.com/uploads/1/3/4/3/134378411/1705417.pdfIn PDF document text
    • https://nepokotivo.weebly.com/uploads/1/3/2/8/132814168/mariroveriwor.pdfIn PDF document text
    • https://cdn.sqhk.co/xexisini/chagjYO/getugofadu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kotodur/acl_pre_surgery_exercises.pdfIn PDF document text
    • https://s3.amazonaws.com/zunewidimem/xapimiwupozefir.pdfIn PDF document text
    • https://s3.amazonaws.com/gotitibekovi/fusuwezuxajoriwonule.pdfIn PDF document text
    • https://s3.amazonaws.com/tezude/53898381213.pdfIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/oxidation_state_of_cl_in_cl2o3.pdfIn PDF document text
    • http://gozudivigel.epizy.com/65507803339.pdfIn PDF document text
    • https://s3.amazonaws.com/kuxegu/78703680106.pdfIn PDF document text
    • https://s3.amazonaws.com/wukara/60884385868.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_off0000ec0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0A 5232 bytes
SHA-256: 2b4febfc531b23653a78bf34d4d6a3680b9c691b7b787731f4165bbc2201038e
font_01_sfnt_off0000fddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDF 11196 bytes
SHA-256: ee7659d49fb6fbe94ccc2bf60eaca8360ab963be1a57440d2eb44d74c1073874