Malicious PDF — malware analysis report

Static analysis result for SHA-256 073fce410e1c12f5…

MALICIOUS

PDF

64.2 KB Created: 2021-02-05 06:46:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 9b4e96a55b1583e24980c5647cdd63be SHA-1: 8c6276700226abb6ef79d6ad05b37277397cee7f SHA-256: 073fce410e1c12f55bca6161f4204e334fef03c26e5a0cb6827448d20557791c
126 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 phishing or trojan payload. It contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain that is likely used to host malicious content or redirect to a phishing site. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further suggests a malicious intent to obscure the true destination through a network of disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://baarspo.ru/aws?utm_term=acid-+base+neutralization+reactions+worksheet+answers+pogil PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454973/normal_5fdb789536bae.pdfIn PDF document text
    • https://cdn.sqhk.co/nuroteditu/hjhbha3/pesegulov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445106/normal_5fe82aff85d26.pdfIn PDF document text
    • https://cdn.sqhk.co/limiwebu/aF8tjjB/54908850969.pdfIn PDF document text
    • https://cdn.sqhk.co/xedufoga/jDjecll/new_york_city_traffic_speed_cameras.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/fisulefajow/weekly_meal_planner_shopping_list_template.pdfIn PDF document text
    • http://xajizufobuvofo.epizy.com/xenuto.pdfIn PDF document text
    • http://voxinuxo.epizy.com/haunted_movie_hollywood.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/wugolitasinonorukowobi.pdfIn PDF document text
    • http://vuxoziv.epizy.com/eden_movie_parents_guide.pdfIn PDF document text
    • http://tuzekejaxegis.epizy.com/telling_time_worksheets_for_1st_graders.pdfIn PDF document text
    • http://risumipekalur.rf.gd/car_accident_reports_san_diego.pdfIn PDF document text
    • http://filusexiwagip.epizy.com/62106663150.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_off0000bccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCCD 5704 bytes
SHA-256: dc5e9c2df6226ebb5a962a6ef00b37874159122c16d876a9bfa10779065abd02
font_01_sfnt_off0000d04f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD04F 10252 bytes
SHA-256: e6ec15262c88385b002d0b602fef22e8598b274330d7813d4813c02727db8888

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