Malicious PDF — malware analysis report

Static analysis result for SHA-256 c03d6427ad54ed74…

MALICIOUS

PDF

80.3 KB Created: 2021-03-13 22:40:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 5daac5357db9039ef5b8c254e9e82848 SHA-1: e9cdcdc9b6637682fe75cc1810e087daa1622d17 SHA-256: c03d6427ad54ed74b277aa6984890d2feba9135481ac3866631b5316fde8f5f8
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF document flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The document body contains garbled text, but the presence of numerous links to disposable domains suggests a phishing or malware distribution attempt. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=how+do+i+control+the+volume+on+my+samsung+smart+tv In PDF document text
    • https://cdn-cms.f-static.net/uploads/4450139/normal_602011c487123.pdfIn PDF document text
    • http://vadosaj.getenjoyment.net/burger_king_meatless_impossible_whopper_calories.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366339/normal_6041828e11c3c.pdfIn PDF document text
    • http://giwapozolaleg.mypressonline.com/convertir_de_pulgadas_a_cms.pdfIn PDF document text
    • https://cdn.sqhk.co/mowezeto/Fehgmhj/welo_taxi_oficinas._hermosillo_son.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422145/normal_5fef0d9364c95.pdfIn PDF document text
    • https://cdn.sqhk.co/reromiwo/Egi8eOa/14927935709.pdfIn PDF document text
    • http://lusolakidareve.mywebcommunity.org/best_pellet_stove_inserts_2020.pdfIn PDF document text
    • http://mivegik.mygamesonline.org/baldur_s_gate_descent_to_avernus.pdfIn PDF document text
    • http://mamontov-net.cc/does_sunbeam_heating_pad_have_auto_shut_off7scnz.pdfIn PDF document text
    • https://cdn.sqhk.co/zotofoza/jgcBWDv/26239050690.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426062/normal_60015515862fd.pdfIn PDF document text
    • http://wunuvuzixuxi.getenjoyment.net/numeros_romanos_del_1_al_200.pdfIn PDF document text
    • http://winoraama.space/how_to_add_modifiers_tinkers_construct6leg0.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://18b09f4e-de4d-4c1b-9fe6-be55c63b1c00.filesusr.com/ugd/cd81e9_0047a65a8bde4a69b0fc2b5f8f68b855.pdf?index=trueIn PDF document text
    • https://f815f12b-539f-4060-8ed9-abd2caada31b.filesusr.com/ugd/ceb2e8_c102efc126a04d2da9b071e01e6066f9.pdf?index=trueIn PDF document text
    • http://fijorolur.myartsonline.com/95878246400.pdfIn PDF document text
    • https://1b3fde16-7575-45ba-b40e-8916c64185ca.filesusr.com/ugd/8874e8_11b7ec0285d44514bf3d8f3d0079926a.pdf?index=trueIn PDF document text
    • http://sidepojedava.myartsonline.com/how_to_setup_bluetooth_on_kenwood_kvt_512.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF15 5448 bytes
SHA-256: 1863a6a3e6ca857f3ff1321543a3821b2482da2453d8a6276fb4012a7ab33b0f
font_01_sfnt_off00010182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10182 10488 bytes
SHA-256: 197ed3c1b48a03a3d6cdfaa59e5a795ef112d660fd6ee001a185a00314704420
font_02_sfnt_off0001256a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1256A 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3