Malicious PDF — malware analysis report

Static analysis result for SHA-256 8aba3f64ca5d71d5…

MALICIOUS

PDF

73.0 KB Created: 2021-03-17 15:46:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 3538e1a1c1a9c8e571ad44de2a7e1710 SHA-1: 089a9b6232f77f8f4948cbe9030b91254e5c44d8 SHA-256: 8aba3f64ca5d71d549bb2da8812ea4c557f040d423b4d13e6c58e9fae94ef7e6
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm used for SEO manipulation or to redirect users to malicious sites. The primary URL, https://xajibur.ru/award?keyword=subject+personal+pronouns+worksheet+pdf, is likely part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xajibur.ru/award?keyword=subject+personal+pronouns+worksheet+pdf PDF link annotation
    • http://mandarin-fruit.space/what_are_the_subordinating_conjunctionssmqtz.pdfIn PDF document text
    • http://thestablestl.com/convert_fraction_to_percent_worksheetzvr5a.pdfIn PDF document text
    • http://sacredname.ru/kenmore_800_washer_not_spinningbn4wd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404975/normal_601905e3ebc46.pdfIn PDF document text
    • http://drenajkrasnodar.ru/weed_leaf_drawing_trippyrp81z.pdfIn PDF document text
    • http://casser.xyz/16371388300630ei.pdfIn PDF document text
    • http://bigtittybella.com/extreme_moto_racing_3d_apk_modfrh6n.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488560/normal_604f1101d5dd7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451565/normal_603a6c72adfd5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://13adc596-845f-4f4a-b539-e2c04a0a4b5a.filesusr.com/ugd/6e2da7_99bc245b85904f7a92288b66272f5b2d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9eb61a5-b46d-47de-8e2a-5c5db0d21c11/how_to_find_my_hotspot_password_on_samsung_s10.pdfIn PDF document text
    • https://77483064-5892-4b52-b419-66e751946b77.filesusr.com/ugd/ef7b09_14509a913e9c44359751247de84a0ad7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab26e552-1ffa-464d-9ea7-6d415d7e26eb/rs_means_cost_estimating_training.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/630c03ce-f4b0-41c4-8ec7-8f65659b2aaf/xakisok.pdfIn PDF document text
    • https://edefa294-c65c-46c5-840b-8a4669b9fdfe.filesusr.com/ugd/e4a001_77ad4973da3c4e60a1ab770b61fdda79.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/30ee9be4-1311-4ee0-ba56-cd984b0759e0/what_drinks_does_taco_bell_have.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6544fb4-141b-403c-8520-c5363866fb7a/86821639091.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_off0000df47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF47 5716 bytes
SHA-256: a4cf9b7e4c9a955566e27a0ec37bb1b019f6dfb61b97b3f6ff56e3a745ce6adb
font_01_sfnt_off0000f2ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CA 10636 bytes
SHA-256: 662d396c2708ff23049cad1d8bf0a5d54205207d0be6bcc07df9cbddb0422868

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