Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f7e031081c4b482…

MALICIOUS

PDF

83.6 KB Created: 2021-05-31 07:03:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 98f76af7e72908cea353ffc4b17a42ea SHA-1: ee5a590de300ac04662fb560f2696432dfb59922 SHA-256: 4f7e031081c4b482a039086fed2de63f38b60793e64518211b1a5a60f35e96d4
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services like Weebly, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of multiple external links, including one with a UTM parameter, suggests an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://ponafet.ru/123?utm_term=instagram+stories++opera PDF link annotation
    • https://rowurasivove.weebly.com/uploads/1/3/4/3/134357219/509348.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369916/normal_600f72f6d74b1.pdfIn PDF document text
    • https://xejukosaxup.weebly.com/uploads/1/3/1/4/131437924/72457ffa7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410006/normal_5ff34eed3e01d.pdfIn PDF document text
    • https://xogegexisupu.weebly.com/uploads/1/3/4/3/134319275/zedovi.pdfIn PDF document text
    • https://sarodinejafa.weebly.com/uploads/1/3/4/7/134762654/9138983.pdfIn PDF document text
    • https://rizomoxus.weebly.com/uploads/1/3/4/5/134589692/tuwodoferod-jodememulagaris.pdfIn PDF document text
    • https://vuzaruluweketex.weebly.com/uploads/1/3/4/4/134478477/4917214.pdfIn PDF document text
    • https://rimimasosonajis.weebly.com/uploads/1/3/2/6/132681992/zetanavowuwijarol.pdfIn PDF document text
    • https://pabarubuvu.weebly.com/uploads/1/3/1/3/131379718/8527272.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386621/normal_601cdf12d94b1.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/458ba00d-8cf2-4049-b93f-1663f6c52403/estructura_de_lewis_del_acido_fosforico.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b29824f-526d-4cef-b38c-5924f4c09f02/71489862042.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/738708ec-cb04-4f01-86a3-c8f13c01619d/6850807578.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bc22ddf-574a-48c3-87b2-97754cef62a1/how_to_identify_axial_and_equatorial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef87efd1-95ac-4039-9776-6a74493fefed/zexusasukevuxuwitif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ad70b2a-3f87-494f-9e00-b789ab45b9a4/64920210915.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bacf962-8134-4d52-ad55-f1aeda26bbb6/97701679799.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e62d73bb-c7d8-4b2b-aba7-c67810336ad1/ferrari_f40_engine_swap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eff3f71d-46c6-481f-89ab-3bc82157d84f/neroxuzuxuzibujava.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77b4f085-0818-48f6-aac5-101ffb95e0d4/how_to_play_taboo_electronic_game.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae55dd2c-7607-4e0f-83fd-bba5d9e96d3f/fahrenheit_451_summary_part_1_sparknotes.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_off0000f99b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99B 4832 bytes
SHA-256: 315e34c683768255c476c1eb80f9b1ca96e22db162c5c1e85520067b84c8f875
font_01_sfnt_off000109e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E0 12340 bytes
SHA-256: 6fbf73d9eb44d7d2d993dac0942201ff8ecfa705469b310826f78531edbf43c2
font_02_sfnt_off00013322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13322 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333