Malicious PDF — malware analysis report

Static analysis result for SHA-256 90c629f41f26813a…

MALICIOUS

PDF

85.7 KB Created: 2021-04-09 04:05:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 748645d84f48a554e9a95806f6eb6585 SHA-1: 2c402b3af0923c7fb45745e1e515cf75bd3c5b0f SHA-256: 90c629f41f26813abc6c8d48cac910f7f5bb69cf4e989c3348d851ea7ed06a61
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 pointing to disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and heuristics point towards techniques used to obscure malicious content and redirect users to potentially harmful sites.

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://vilenefex.ru/strik?utm_term=1984+comprehension+and+analysis+questions+chapter+1 PDF link annotation
    • http://adminhalil.com/canonical_correspondence_analysiswjc1w.pdfIn PDF document text
    • https://cdn.sqhk.co/tibakekavero/AhdjcMr/285_armored_car_money.pdfIn PDF document text
    • http://forkidsshop.online/how_many_users_can_use_rosetta_stone8l9jv.pdfIn PDF document text
    • https://cdn.sqhk.co/momugutatok/eifihhe/36199036579.pdfIn PDF document text
    • https://cdn.sqhk.co/nevenupixe/jhcV5ii/free_printable_letter_n_coloring_sheets.pdfIn PDF document text
    • http://fiwazurenorin.iblogger.org/the_nutcracker_piano_sheet_music.pdfIn PDF document text
    • https://cdn.sqhk.co/fekigimuzib/jhGjTtE/besofina.pdfIn PDF document text
    • https://cdn.sqhk.co/ditutafewaw/hcie5uJ/wolfquest_anniversary_edition_updates.pdfIn PDF document text
    • https://cdn.sqhk.co/sixepatexup/jhjHNii/retro_brick_bianco_matte_bullnose.pdfIn PDF document text
    • https://cdn.sqhk.co/pazaxefuma/hnjhehJ/86016787081.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1a441fb4-51dd-4528-a053-eb59ff664e18.filesusr.com/ugd/43d9d5_a03127fdfe2d4ae2a5b07699b8cdcb10.pdf?index=trueIn PDF document text
    • https://11ab4cf5-156d-4417-99e9-5039b2a7eb5f.filesusr.com/ugd/82d61e_9db7cbee6c3342a0969bce00d5471015.pdf?index=trueIn PDF document text
    • https://bdc3fad0-85dd-4e34-85f7-620d54d4ff6f.filesusr.com/ugd/10cedf_ddfb5e30bbcb404d9fc2cf8a5e5ca059.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/89c4fd5a-c657-4ccf-bae4-e4ba1be2345e/hp_laserjet_p2055dn_toner_cartridge.pdfIn PDF document text
    • https://9579f988-9383-433c-acf3-5fff76e0c882.filesusr.com/ugd/191a6d_83713c923702414daf039541726ed291.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0216ce61-6149-44d2-8728-3f580697c8e5/dewalt_dwe7480_table_saw_for_sale.pdfIn PDF document text
    • http://mujunego.epizy.com/bunch_of_thoughts_in_tamil_download.pdfIn PDF document text
    • https://b3a1a1c9-4f8f-4fb8-b7cc-7339030cc889.filesusr.com/ugd/162fe6_081a6177136c4857a5e7443f08ef9729.pdf?index=trueIn 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_off00011036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11036 5936 bytes
SHA-256: 5f19d6fdcfcf2a93e1a29456642c001916f151f577636695d5b0fbf64a4e7bcf
font_01_sfnt_off00012446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12446 11028 bytes
SHA-256: d851827255f428207563e0e8bdf5fecb66ca953c835a1cfa8ef6cbde5994d3a2

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