Malicious PDF — malware analysis report

Static analysis result for SHA-256 729720b0270663a8…

MALICIOUS

PDF

87.8 KB Created: 2021-03-20 11:39:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 1c23dc3bf4bf0e7182a787e44d68b1ac SHA-1: 2f6985a8fa39d2bf6e84d102b63dc2f4ad452a10 SHA-256: 729720b0270663a8006b9ea5065bc736a673020045ed7f9c97b2587a2cb39947
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 5

  • 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 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://baarspo.ru/123?utm_term=circuit+simulator+for+pc+free PDF link annotation
    • http://fumigatoff.online/bodixeyawdp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366637/normal_60554a1b8e6fd.pdfIn PDF document text
    • http://pro-komp-master.website/battle_of_gods4olor.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392861/normal_5ff0db0535995.pdfIn PDF document text
    • http://tersq.space/39455662381e5vck.pdfIn PDF document text
    • http://fruitik.space/34856600364lhq7.pdfIn PDF document text
    • http://instgrmmverifiedbadge.com/45279781181fuyn7.pdfIn PDF document text
    • http://milanbeach.fun/femesokizapevnzuax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421960/normal_5fe7009cb13c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450043/normal_604ee5c1d393e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475208/normal_601973521efdd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368979/normal_6053592c5748b.pdfIn PDF document text
    • http://bettyloustintruckbbq.com/covid_cases_in_my_area_scotland_postcodebziir.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493579/normal_5fdcb56235df9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445544/normal_6030622dab97f.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/3628c2db-adfa-4c90-83c7-2cea9e4fe1d9/how_did_the_agricultural_revolution_contribute_to_the_start_of_the_industrial_revolution_brainly.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94c08caa-7736-4e6b-92f9-2e7ee1b57ea8/electronic_devices_and_circuit_theory_10th_edition_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1388aa42-bd63-49a9-b755-e6af40557c7c/60960164946.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2af6851f-e2f1-4856-b8d7-f82d0c017e7b/68940965174.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba8f98ca-2182-40c7-a417-4087b51c6352/99772957118.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bca57c0e-185e-4d11-8861-3913256e0139/47555177777.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a0b45b7-23a4-4cdf-8945-abd55b2cc511/jarixa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c542c856-89f8-495e-a9fd-d5c84aeada89/bersa_thunder_9mm_ultra_compact_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/003b6d4e-e584-4901-95bf-3e5c5aa16a81/ap_stylebook_oxford_comma.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_off0000fd60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD60 5064 bytes
SHA-256: 61c6a8c89e814edda0f5cb12ae70bc79ec68900673a9a45728befa4a300e50c6
font_01_sfnt_off00010e83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E83 10972 bytes
SHA-256: 5f980edee32e014cf80b70dcbf4e46baee8d15882bc166c4f4ec50a586d0eb32
font_02_sfnt_off0001346c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1346C 18572 bytes
SHA-256: f0ec8d85fcc33d9d110986c23c43848bd57eaf1dcca5c887911972ecc5d0d255