Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b40d05df3505804…

MALICIOUS

PDF

79.3 KB Created: 2021-03-18 04:25:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: cc62d3a7dbe14c8e45db3eb4c7cd500c SHA-1: 5296a6ce2b4b738ac5c98e4bedd50d1efa5b22de SHA-256: 9b40d05df35058042c0545e9f2a3a7483fc8563a679583f2515d14652f6f814b
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm and detected as malicious by ClamAV and an ML classifier. It contains numerous external links, including one to `maypoin.ru`, suggesting an attempt to direct users to potentially harmful websites. The presence of embedded JavaScript, though not explicitly detailed in the provided evidence, is a common technique for obfuscating malicious redirects or actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://maypoin.ru/123?utm_term=nice+guidelines+foot+care+diabetes+2015 PDF link annotation
    • http://subulowopuriko.iblogger.org/graco_nautilus_80_elite_3-in-1_harness_booster.pdfIn PDF document text
    • https://nufewaxitobazat.weebly.com/uploads/1/3/4/7/134748461/2551999506ebb.pdfIn PDF document text
    • https://cdn.sqhk.co/kozutani/jf12jgi/vajumem.pdfIn PDF document text
    • https://ruminugovukaka.weebly.com/uploads/1/3/0/7/130740017/zavoniwe.pdfIn PDF document text
    • http://meserowogawak.iblogger.org/8971064447.pdfIn PDF document text
    • http://zofoxexizoviro.iblogger.org/38604748909.pdfIn PDF document text
    • https://seporarutigofu.weebly.com/uploads/1/3/2/7/132741198/d176d.pdfIn PDF document text
    • https://noremovex.weebly.com/uploads/1/3/4/8/134883944/rafexanafasiver_gipituvibeno_lavij_fidubusuge.pdfIn PDF document text
    • https://cdn.sqhk.co/rosisole/6hdPEmC/inflatable_water_slide_rentals_utah.pdfIn PDF document text
    • https://cdn.sqhk.co/vitimosugu/J5hdgeh/destiny_s_child_cater_2_u_album.pdfIn PDF document text
    • https://cdn.sqhk.co/sotatixorawi/ichjDhf/commuter_bikes_for_sale_ebay.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/804d7a53-6cb8-406f-8239-7d77cfdbef24/harman_xxv_pellet_stove_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09b9441a-90e3-43dd-8553-b9336774b1e8/seloguwakamukedixi.pdfIn PDF document text
    • https://f64a1a0a-debf-4843-a838-a34c0cae0f4a.filesusr.com/ugd/89602e_fca2d181160d443292f7ba60df23ef94.pdf?index=trueIn PDF document text
    • https://1de4b56a-3309-4767-83a2-f1bb1ea7c594.filesusr.com/ugd/a6e5e9_24d90a384d09423782687c46e0fef20b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1535b9c-6d80-4977-bc7b-282d6f091374/why_are_arms_attractive.pdfIn PDF document text
    • http://xepalufozakot.epizy.com/papillon_imdb_parents_guide.pdfIn PDF document text
    • https://451b78f8-089e-4d4d-bc4b-60abb621f7e6.filesusr.com/ugd/7ef0dc_6a841bdf394541daa28e141e031d95af.pdf?index=trueIn PDF document text
    • https://31c8a3d4-0132-49f1-a04f-09c79d03e01f.filesusr.com/ugd/a4da84_c8b7f03518a5431eb44262a90f71b143.pdf?index=trueIn PDF document text
    • https://d2d87fd5-5f4d-49aa-ab3c-2263ce4b5d22.filesusr.com/ugd/9169d2_0e431835f0614d0194ca85ae08de0fd7.pdf?index=trueIn PDF document text
    • http://jimeroxivekafos.epizy.com/canon_200d_mark_ii_battery_backup.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE273 5748 bytes
SHA-256: b054d58f02842424a8286b79dc50374f5c962bdf42e342176427bf799bb38384
font_01_sfnt_off0000f623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF623 10580 bytes
SHA-256: 42c22e117dafa83cd8b5d31ff382451acc835d0ea4fef2506c31eed02320572a
font_02_sfnt_off00011a78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A78 16060 bytes
SHA-256: 99ddc6f5858eb134f8024171ebe717cbd02485c31471b921a5021903b5272953

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