Malicious PDF — malware analysis report

Static analysis result for SHA-256 31a972da512044ec…

MALICIOUS

PDF

81.9 KB Created: 2021-03-22 02:01:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: ad45e9f3a1953229fe5da1a27b946a6a SHA-1: c09e02b73e70a60bea4d3228ea9042009a546b39 SHA-256: 31a972da512044ec0fa00adbc3ea9058d63be2731b0f7cd81349b8fd0244b2f3
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body, though corrupted, contains metadata indicating it was generated by wkhtmltopdf, and the presence of embedded URLs further supports the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/123?utm_term=hadestown+sheet+music+epic+iii PDF link annotation
    • https://xuravamu.weebly.com/uploads/1/3/2/7/132740838/1cb4e5bf6d.pdfIn PDF document text
    • https://gurawibozogudex.weebly.com/uploads/1/3/0/7/130739732/2017163.pdfIn PDF document text
    • https://rofowijajexer.weebly.com/uploads/1/3/4/4/134476616/5025192.pdfIn PDF document text
    • http://vaxozudobe.22web.org/how_to_make_bragg_apple_cider_vinegar.pdfIn PDF document text
    • https://cdn.sqhk.co/tokebamojos/YjhjjsN/listening_disorders_symptoms.pdfIn PDF document text
    • https://cdn.sqhk.co/torevebeti/Xzjjhas/steroid_induced_hyperglycemia_treatment_guidelines.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bodumenijos.epizy.com/39711717782.pdfIn PDF document text
    • https://8ac5c8e1-9174-427d-95c2-90bebb9f105a.filesusr.com/ugd/44b221_f63847f43db642528e67b1b077d6d399.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7af20e13-2af4-48e6-a227-0c848aaafde4/how_to_overcome_piriformis_syndrome.pdfIn PDF document text
    • https://s3.amazonaws.com/wifiduxezo/vizio_32_inch_tv_1080p_walmart.pdfIn PDF document text
    • http://mulurezo.epizy.com/ronero.pdfIn PDF document text
    • https://s3.amazonaws.com/vojapu/how_to_change_the_time_on_a_norstar_m7310_phone.pdfIn PDF document text
    • https://3176e400-c268-4dc0-8d69-08eae86937f8.filesusr.com/ugd/ea2f88_94ee74fe8fb6431ebc13312000df2bb2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d3f3d32-159c-457d-beef-81d06edb1a99/matameniw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1dde1c7-8931-4c54-986d-04c6f09c938e/43662863932.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac69d176-b0a5-4f26-a79b-f1f1ecb7fb46/zero_limits_ting_vit.pdfIn PDF document text
    • https://s3.amazonaws.com/mojivikapeti/what_is_the_purpose_of_a_descriptive_text_structure_what_does_it_do_for_us.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82d752b5-fdcb-41f6-a19b-60f7f8702d2e/1074750248.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_off000105e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E3 5240 bytes
SHA-256: b1d2f37a6c65d64a37d21f34b402a5e9ffa7e09f3fe190ac775cf25d7495cd5b
font_01_sfnt_off000117a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A7 10196 bytes
SHA-256: 5ca4f9f07cb553c748a15ff2bb99757a733937e3b90e24f71ebcaa1de5b2c74a

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