Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9dcea037524b1e0…

MALICIOUS

PDF

74.0 KB Created: 2021-03-25 22:56:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: cb2924ca86a101cb9da4a5dc8a0cc192 SHA-1: 23cac551a6eabcc4f21b07e936751fb4e0a71f77 SHA-256: c9dcea037524b1e01d4b80efc6accad284f3d2dbdac849bade10f9b8cb07ae48
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains an embedded URL that redirects to a suspicious domain, likely serving as a lure for users seeking printing instructions. The PDF structure and embedded content suggest it's designed to exploit user trust and direct them to malicious sites.

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
  • 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://xajibur.ru/strik?utm_term=how+to+print+from+laptop+to+hp+deskjet+2620 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366653/normal_603d7e22767d7.pdfIn PDF document text
    • http://falakumisiwubaw.iblogger.org/60598389770.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425237/normal_60381b1e9e5df.pdfIn PDF document text
    • http://buytoday.cc/partial_differential_equations_strauss_solutions_manual4c7q7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371004/normal_5fee2ef4a4f5a.pdfIn PDF document text
    • http://help-bluebadgecenter.com/asciidoc_cheat_sheetyl4nv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489057/normal_5fef7d1e4a58d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502175/normal_6013dd084e330.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379618/normal_60019c5d4ded9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466676/normal_6009ea2279962.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/37920191-bdaf-44ec-b849-1c31f8ab57bc/78973481474.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxawetawupo/44089356207.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5f63611-a2f9-436a-8a1a-521eb778d3e0/huebsch_top_load_washer_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/fipijife/methods_for_testing_antioxidant_activity.pdfIn PDF document text
    • http://ruzuzis.rf.gd/uva_mba_employment_report.pdfIn PDF document text
    • http://lavodusepigixu.rf.gd/barfi_movie_songs_itni_si_hasi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b99b02a-7be7-4a7c-974d-b113f5409440/26713319935.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c193bd97-e579-4737-9c08-b42e05fa8a56/89329097123.pdfIn PDF document text
    • https://s3.amazonaws.com/kevava/light_waves_and_matter_physics_classroom_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aadbfc78-02cd-4a4a-9865-73f5b0c968e5/fifotijululerejigegixa.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_off0000e1b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B8 5900 bytes
SHA-256: 7b9989335b80e88dc8079f28fcdba1b12e6fc1322ca1c5c3dc3a420d385e8b3d
font_01_sfnt_off0000f5b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B9 10724 bytes
SHA-256: db1db528db89c8058cbc0afa0d646abbc98972986ef333e3156546f15c9baf04

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