Malicious PDF — malware analysis report

Static analysis result for SHA-256 8346ed5cb8ec508a…

MALICIOUS

PDF

80.7 KB Created: 2021-02-15 07:50:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 690abd8ac677a88d308b7bf5d037f76a SHA-1: 4dc1d003c8bb529fbb2967f65c95a5734ad7d323 SHA-256: 8346ed5cb8ec508aaf330645ae2585ee22dda44d3d28f9833bb6f1005cf8318d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to external sites, many of which are associated with link farms and disposable hosting, indicating a phishing or scam campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity, likely aiming to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://maypoin.ru/aws?utm_term=background+remover+software+free PDF link annotation
    • https://cdn.sqhk.co/rojawamusula/jbhchhi/fatoto.pdfIn PDF document text
    • http://storeeu.info/65650648661uzrq7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480735/normal_5fd66df329acf.pdfIn PDF document text
    • http://hellovendi.com/stalker_shadow_of_chernobyl_free_download_megaf1ctt.pdfIn PDF document text
    • https://cdn.sqhk.co/rureroso/byijajT/rtc_full_text_search.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487897/normal_602100ede6302.pdfIn PDF document text
    • http://igafnd.org/11508089786l3jg3.pdfIn PDF document text
    • https://cdn.sqhk.co/tedogegez/jb0iehf/1331406531.pdfIn PDF document text
    • http://thecaffeinatedstudent.com/caesalpinia_pulcherrimakkn9b.pdfIn PDF document text
    • https://cdn.sqhk.co/nubalevuvem/a2hijf3/edward_snowden_wife_lindsay.pdfIn PDF document text
    • https://badexakabenal.weebly.com/uploads/1/3/4/0/134017850/tewomudud.pdfIn PDF document text
    • http://piredvizhnik.com/buvizujokariwujini7nd.pdfIn PDF document text
    • http://itdiscount.info/pierogi_kielbasa_sheet_pan3hrhf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sovizaz.epizy.com/assistant_administratif_formation_en_ligne.pdfIn PDF document text
    • http://bavodokebak.rf.gd/55211888839.pdfIn PDF document text
    • http://gefetela.epizy.com/chundari_vave_shreya_ringtone.pdfIn PDF document text
    • http://gaxodisesi.rf.gd/96677265934.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_off0000fd26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD26 5572 bytes
SHA-256: 815552e0d11861384191ce174721ad6932ec3965a75343846445aac2159fbca6
font_01_sfnt_off00011021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11021 10960 bytes
SHA-256: d30b597106caf2fc0cee565d7a0b198b30faf2b0981d35e2df1dd0accec7c857

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