Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b62cfc6a49f46c9…

MALICIOUS

PDF

86.2 KB Created: 2021-03-12 00:59:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 29dcbbda27a3a9b4b7d63c78e9743fd7 SHA-1: 2f84f0d64a3600753832a8d6a7c5365cbe290fbd SHA-256: 7b62cfc6a49f46c900bf98806496137b2f9aafbf09cc7bc1dfb6b50b12b3501a
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by both ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable domains, suggesting it functions as a link farm. The primary URL, 'https://seumenha.ru/award?keyword=academic+word+list+with+arabic+meaning+pdf', indicates a lure related to academic content to attract users. No scripts were extracted, but the PDF structure and link farm behavior are indicative of a phishing or ad-revenue generation scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/award?keyword=academic+word+list+with+arabic+meaning+pdf PDF link annotation
    • https://cdn.sqhk.co/patagarinixa/PhhQPie/13064676532.pdfIn PDF document text
    • https://cdn.sqhk.co/mafulavet/ghjngfU/toca_lab_plants_what_do_the_symbols_mean.pdfIn PDF document text
    • https://cdn.sqhk.co/fejavegiwo/TaAOFAq/43502564749.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422643/normal_6003e60944b3e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421062/normal_5ff4a50fb5e27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406241/normal_6040d55381724.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375086/normal_60084fbecf283.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416661/normal_60445b4f159e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418013/normal_600d6a7195be0.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/21f28ea9-c454-4d08-9529-81c360f06a79/long_460_tractor_parts_for_sale.pdfIn PDF document text
    • https://2ed821ec-8078-4e74-b11b-c5cec6a88262.filesusr.com/ugd/65e777_973604ad276a46c898134a4bf349e5de.pdf?index=trueIn PDF document text
    • https://d99c26cc-8c68-456d-a039-1a26994c8d26.filesusr.com/ugd/105a8c_b2e46b648d444feeaf26cddcbe24e436.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a3f13eb-65d4-4935-942d-78fb7085107c/bakukilijokelanasawejukuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d426ae3d-df4b-443e-83a2-2ee4deb301b0/the_holy_quran_best_english_translation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9610bf05-6d1a-454d-9a24-f44ce23bafe7/how_to_remote_start_2017_lexus_gx_460.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0bcef5a-a77c-4760-89d8-dff19a954ae9/lg_top_load_washing_machine_1e_error.pdfIn PDF document text
    • https://a98f38e8-5810-4fc9-be6a-c3d78c7c4f9f.filesusr.com/ugd/921909_ed49069b96e141b7a27e4a8caa688bb0.pdf?index=trueIn PDF document text
    • https://a8a70d16-e3f0-4805-b115-4d8c62c40b57.filesusr.com/ugd/82e28d_07d127dc564943489acb021cc5126348.pdf?index=trueIn PDF document text
    • https://92923600-264c-4cb8-9d87-181083d4f0d6.filesusr.com/ugd/0bf43f_f1251ddda4b3493d96c21cd0fa9d47a0.pdf?index=trueIn PDF document text
    • https://387a498e-9551-4239-9507-3183ba214552.filesusr.com/ugd/cd403b_0eb76c9dbea04513a7a91f001c5e9175.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10796 5576 bytes
SHA-256: 96f95ca6de4c371fd2e7a97cac18a0438d1ae38bd1535ed72f1ad4630fadfe1a
font_01_sfnt_off00011a65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A65 10252 bytes
SHA-256: 2fc34ebfe00d4287107c893fe4ba85e9d491ca87da27308c3d22788a52b563e8
font_02_sfnt_off00013d7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D7F 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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