Malicious PDF — malware analysis report

Static analysis result for SHA-256 41fc41b512c24807…

MALICIOUS

PDF

94.3 KB Created: 2021-04-19 02:56:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 75539303fb8dcde4843f91366cb181ee SHA-1: b19e93d9b9cc21424f190326c512235b00c13b19 SHA-256: 41fc41b512c2480799a888ae9509bb19e009f11bc27b3cf97309d245c3e564cd
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 0.9994

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
  • 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://resalured.ru/strik?utm_term=toyota+corolla+2009+1.6+hp PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4478928/normal_604d97a6806ef.pdfIn PDF document text
    • http://shopyou.online/where_are_american_water_heaters_made1irq7.pdfIn PDF document text
    • http://bioforce-co.site/87893192731mqwq8.pdfIn PDF document text
    • http://revershjtb.site/zuxubokigefowizugeosavn.pdfIn PDF document text
    • http://tb-films.ru/wolverine_f2d_titan_film__negative_scanner_review8uizd.pdfIn PDF document text
    • http://sellforce.ru/how_to_connect_symbol_barcode_scanner_to_computer3948l.pdfIn PDF document text
    • http://kesisofawa.mygamesonline.org/canciones_de_guitarra.pdfIn PDF document text
    • http://marketes.pro/one_punch_man_season_2_episode_13_mangan4q6s.pdfIn PDF document text
    • http://itrom.fun/yard_king_snowblower_beltsnowlb.pdfIn PDF document text
    • http://wopexobow.mywebcommunity.org/85483864136.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490752/normal_6029016203553.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380073/normal_6007542270110.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dufobirufo.atwebpages.com/multivariate_hypergeometric_distribution.pdfIn PDF document text
    • https://abaaaae4-9231-44fc-b12c-ad55ebcc68e7.filesusr.com/ugd/2ca09c_317f92eae074418b966247ef232434ed.pdf?index=trueIn PDF document text
    • http://zozupajekuledus.myartsonline.com/84212905303.pdfIn PDF document text
    • http://liroporuki.myartsonline.com/best_lg_tracfone_2020.pdfIn PDF document text
    • https://4ef57e19-9a2e-4e6f-a444-f6b59f982a39.filesusr.com/ugd/4c1554_cbbd4c5fab8f4aa1909e1f285cac4966.pdf?index=trueIn PDF document text
    • https://85fc0914-20e3-4f1c-be8c-de7e6f89f47e.filesusr.com/ugd/a44510_44d423ea511a4ef8acde59227af3149d.pdf?index=trueIn PDF document text
    • https://5f90d536-2a72-4461-adff-280afd3056cb.filesusr.com/ugd/27c394_1ba86099406e4fd8a79b8916ada001b2.pdf?index=trueIn PDF document text
    • https://b56e6f12-3f4b-4b75-bc29-9585eb3fba71.filesusr.com/ugd/73f0dd_5551c04f8aa44033b065e55eb5464e0f.pdf?index=trueIn PDF document text
    • https://1df32be7-5e6a-491e-80e4-5c558052ef26.filesusr.com/ugd/e02e08_606f6ceb47dd477e819d6ab0a3b4bf54.pdf?index=trueIn PDF document text
    • https://6a9ecc2b-05c3-4056-8705-773ae6be8cdd.filesusr.com/ugd/7a359d_791c6b1e82d84949bbcbdf1ad37ab124.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
    • 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_off00011cec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CEC 5560 bytes
SHA-256: 703b70905f121b1044bc90e468719f4f0902349d8c99cdea082eed8af49311f1
font_01_sfnt_off00012fdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FDC 11576 bytes
SHA-256: f1074cfec3c5f8053c5956d19fe55d3c077a64fae7d8f40479a5c018537f89d1
font_02_sfnt_off00015728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15728 16060 bytes
SHA-256: 99ddc6f5858eb134f8024171ebe717cbd02485c31471b921a5021903b5272953