Malicious PDF — malware analysis report

Static analysis result for SHA-256 70372f1126c32682…

MALICIOUS

PDF

70.5 KB Created: 2021-04-14 04:45:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: bd3684bdd9dc3135ceb2255de4d36d34 SHA-1: 72508f43554f11e1a95607c50efcfd760f8c8426 SHA-256: 70372f1126c32682ccc50b4a4b9183d9eaf6beb919095b09e02d58c978e3daa9
254 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to redirectors and SEO link farms, indicating a phishing or malware distribution attempt. The primary malicious link identified is 'https://crophysi.ru/strik?utm_term=scooter+repair+center+near+me', which is presented as a search result. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=scooter+repair+center+near+me In PDF document text
    • http://laitlabs.pro/electrical_engineering_course_online_freeg6zbu.pdfIn PDF document text
    • http://jinosewifuwefe.22web.org/titas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488855/normal_5ff5a4307efa6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368481/normal_60450a7faefbe.pdfIn PDF document text
    • http://jufikubenisobo.iblogger.org/cours_chimie_atomistique_l1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447084/normal_602fe0021c898.pdfIn PDF document text
    • http://tadezutalowebe.22web.org/9985022464.pdfIn PDF document text
    • http://stankovit.ru/dutch_sheets_intercessory_prayerjiv6z.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jomewuborova.rf.gd/english_grammar_worksheets_for_class_6_cbse_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/bugutaj/administrative_officer_resume_format.pdfIn PDF document text
    • https://s3.amazonaws.com/jubiferekaka/arcing_horn_gap_in_transformer.pdfIn PDF document text
    • https://s3.amazonaws.com/dikobepibelun/nursing_diagnosis_book_online.pdfIn PDF document text
    • https://s3.amazonaws.com/dowesitobuga/avgn_adventures_2.pdfIn PDF document text
    • http://zaritopewebo.rf.gd/69380303286.pdfIn PDF document text
    • https://14579757-8399-40ae-9aa0-1c510f02119b.filesusr.com/ugd/5613ee_2d556ff6fc9d49909e87206213c10092.pdf?index=trueIn PDF document text
    • https://f3215690-35ba-4bce-915f-db1a6f912a1b.filesusr.com/ugd/d32599_5fa23869707d4d4382c5d51960d947dd.pdf?index=trueIn PDF document text
    • https://12f7643e-9106-4823-89c2-0bdaecd1bc22.filesusr.com/ugd/1f6d71_4e1c83fce159446985d2d7ae61677d14.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_off0000daea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEA 4972 bytes
SHA-256: b9277104c1052d5790e8818df329b874757cd30c90ebb29eea9c9ef5bcc1f7fa
font_01_sfnt_off0000ebbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBF 9868 bytes
SHA-256: 0af2bac61043a92ff4e815b38b9212b9dd7a8e213d342458ffe795555d512318