Malicious PDF — malware analysis report

Static analysis result for SHA-256 03d72fe4e2940da2…

MALICIOUS

PDF

82.8 KB Created: 2021-02-11 06:44:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4f9d8d024c2d8a1bb3cc2456ff289bd1 SHA-1: 6b7bb3309e3164907ffcbc6ffe7eda0ea8d2de52 SHA-256: 03d72fe4e2940da2c825d3f52b9a15120d24ded55c6e0f678b81d97036b9d913
184 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://crophysi.ru/wb?keyword=guidelines%20pulmonary%20embolism%20in%20pregnancy'. This URL is identified as a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The document body, though partially obfuscated, contains text related to medical guidelines, suggesting a lure to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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 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.
  • 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/wb?keyword=guidelines%20pulmonary%20embolism%20in%20pregnancy In PDF document text
    • https://static.s123-cdn-static.com/uploads/4385415/normal_600829ba28f73.pdfIn PDF document text
    • http://omerkatanalp.com/87681380984g8h7s.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416921/normal_60067d0d740a0.pdfIn PDF document text
    • http://nafaguxidu.iblogger.org/classifying_real_numbers_venn_diagram_worksheet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445343/normal_5fd7d0221e197.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387819/normal_5fce5af7ad500.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414341/normal_5fd7bc5e4bb88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412154/normal_5fe8edc626381.pdfIn PDF document text
    • http://poverkavoda.website/18212068237htpp2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451752/normal_5ff2bd3b33096.pdfIn PDF document text
    • http://letonibi.iblogger.org/rekolafi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410953/normal_5fdf921b3797a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/kukazowox/19267550126.pdfIn PDF document text
    • https://s3.amazonaws.com/teximikamukubo/enlarging_pictures_using_grids_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/jazamerijekufol/the_art_of_business_process_modeling.pdfIn PDF document text
    • http://rexawisoza.epizy.com/gubinipokusajanob.pdfIn PDF document text
    • https://s3.amazonaws.com/wizakokowe/piriformis_muscle_injury.pdfIn PDF document text
    • https://s3.amazonaws.com/tokudapele/80606535323.pdfIn PDF document text
    • http://gofosuxubajo.epizy.com/fomixamedokumabib.pdfIn PDF document text
    • http://lesofowan.rf.gd/jewatubibosiba.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF759 5468 bytes
SHA-256: 830893cb5dcc6e8c88b3246b31bba269a3316ef05af5e7cd50407a7c237e2620
font_01_sfnt_off000109c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C7 10992 bytes
SHA-256: 18d80177a71a01f4a6f6dfdc2a5775bdd2aed9d8df51f564ee269743b99155a5
font_02_sfnt_off00012f36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F36 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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