Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1b718527bed7629…

MALICIOUS

PDF

80.1 KB Created: 2021-05-30 03:42:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 806b7858c0c9e292f00698ed4d390f17 SHA-1: a974ca99f2cf01e4b33d30fe933ed38b41b3d002 SHA-256: a1b718527bed7629dd1e6b7edd05581b3e505da40e676cc71952fa1a0bbf235d
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://mezovuduw.ru/strik?utm_term=pandas+get+first+row+after+sort PDF link annotation
    • https://mitexasax.weebly.com/uploads/1/3/1/8/131857270/wunelivowitavoviz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414691/normal_5fc7541020e00.pdfIn PDF document text
    • https://fupefasupemeze.weebly.com/uploads/1/3/4/3/134315788/kajorulomelelaxuk.pdfIn PDF document text
    • https://selewoxad.weebly.com/uploads/1/3/4/5/134523288/femibonetu-ralipawegidefux-koxirevole-geredenazogadu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392474/normal_6027e4c976419.pdfIn PDF document text
    • https://tagipuzato.weebly.com/uploads/1/3/0/7/130776724/rumibufasof.pdfIn PDF document text
    • https://zaduguwage.weebly.com/uploads/1/3/0/8/130874015/xawune.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465000/normal_600b4948938fb.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://uploads.strikinglycdn.com/files/7db8c03d-2268-478d-a4ca-37f6c0ad8b87/mechanical_engineering_average_salary_us.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6580ca44-59e3-4fd5-96d1-989602f35f44/tipos_medios_de_comunicacion_masiva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44988c1e-6f29-4d15-8fe5-3ffed989e801/blender_rigging_unity_tutorial_beginner.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c05735e-626f-4da9-a65b-db0fe2b91377/how_to_request_credit_limit_increase_for_chase.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53c89dde-340b-4344-b3dd-8821c09dad00/nazizanetetitel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6f28bda-2570-4e5b-a969-66c6b94e395f/60490067885.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e73f1966-04e3-4ba2-9156-766dcffb8976/kia_stinger_gt_custom_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d579afe7-b4a0-4f50-9126-9416cb839de2/rewozivovo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90e7b476-d9c7-4314-b0c5-7ad10ada92d1/wabasidumo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/168440c4-7051-49fb-b3d9-10055b487092/how_to_tackle_climate_change.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32d3b676-f0d0-4734-ae8f-682addd87758/garmin_vivofit_3_watch_band.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE547 4924 bytes
SHA-256: a1cb302848b272ab0a557d6a1beb1f994f14a7c848109ae89ee00339739babc7
font_01_sfnt_off0000f611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF611 1800 bytes
SHA-256: 6d2a3a16cc464ce72cf05976c7f96a31c93af2202e0dc760c37a694345e222ee
font_02_sfnt_off0000fea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA1 11044 bytes
SHA-256: 38b383277f17dfa070133655cace9cee1844b1d4c8f301e1b3bb2c0bc0ccf401
font_03_sfnt_off00012460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12460 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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