Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c15302c8f56d6ce…

MALICIOUS

PDF

85.0 KB Created: 2021-03-05 11:17:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4b1727862811f9d4887545d5bfdb52fa SHA-1: a27c73953c289af06ccd48727b0272645c8f4176 SHA-256: 7c15302c8f56d6ce0798fef150ddfdd7817bb2b6f02cedb4d98c104575b271cd
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links. The embedded URLs and the PDF_SEO_LINK_FARM heuristic confirm the primary attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gimoguvi.ru/123?utm_term=biological+development+psychology+examples PDF link annotation
    • https://letazofuwukuge.weebly.com/uploads/1/3/4/8/134869061/wexojez_kebumetoximoxud_xuwetugilagax.pdfIn PDF document text
    • https://popupobapovuzus.weebly.com/uploads/1/3/4/0/134012290/1419356.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469378/normal_5fefc13ddbe4c.pdfIn PDF document text
    • http://nalivosebek.22web.org/segubemigifupebuk.pdfIn PDF document text
    • http://vibuluvizawo.66ghz.com/tosepeni.pdfIn PDF document text
    • http://banisizugevota.22web.org/chapter_4_displaying_quantitative_data_worksheet_answers.pdfIn PDF document text
    • http://wagumoba.iblogger.org/atlas_copco_compressor_parts_dealers_in_india.pdfIn PDF document text
    • http://gazopulodagifus.iblogger.org/new_assamese_poem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419628/normal_602637220b7b4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/acca083b-22cb-4eca-b63c-4a1b528c6a74/75697297311.pdfIn PDF document text
    • https://6997f972-013f-4c6f-ac95-4179ba17a557.filesusr.com/ugd/549e1a_233d26de75c44c86a681e54fd4c54b53.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/14acc737-b6b6-4dca-b4aa-1822e8a95b90/fresh_mechanical_engineer_jobs_in_oil_and_gas.pdfIn PDF document text
    • http://kufawabizoz.rf.gd/data_science_course_fees_in_mumbai.pdfIn PDF document text
    • https://ff4d9611-e7ea-45f2-85d3-f0b464ef817f.filesusr.com/ugd/48f461_d8395d5e50ee477eba175ab799134b1e.pdf?index=trueIn PDF document text
    • https://d3826037-6016-486c-99e9-dc41bc666644.filesusr.com/ugd/b81754_59c17f6f9a06417b9c5b42923bbb355e.pdf?index=trueIn PDF document text
    • http://japorivexasore.epizy.com/robukifexutunej.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_off00010ed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED3 5672 bytes
SHA-256: 3824da5b9c3e567644a19408a244bda017fc360b55c19a52a958c306cd60958b
font_01_sfnt_off00012218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12218 10692 bytes
SHA-256: 86f0e1335bf07ead91c7a1a5f20af7066a3a4645e8ac8bfcf066984a184463fb

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