Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1cfd46172fa9908…

MALICIOUS

PDF

160.7 KB Created: 2021-04-03 18:52:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 2fae3facf5cbc158ca13f10c09935c4e SHA-1: c0f7fb80943ff32ef7281aa9c25fa02b96b0ad68 SHA-256: b1cfd46172fa99086ca852a674b18d582a25dbd6d8b93197500bfea00312c340
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting services and are part of a link farm, indicating a phishing or scam attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious content or phishing sites. No scripts were extracted, but the PDF structure itself is used to host and present the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://jottigo.ru/strik?utm_term=pioneer+vsx+1020+receiver+manual PDF link annotation
    • https://solubowobadiwu.weebly.com/uploads/1/3/4/6/134642134/fumusozagaf.pdfIn PDF document text
    • https://jagunafine.weebly.com/uploads/1/3/4/3/134363358/8201412.pdfIn PDF document text
    • http://xusekulatubobip.22web.org/arabesque_flute_1_sheet_music.pdfIn PDF document text
    • http://fubewakixodi.22web.org/22716471782.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.thdl.org/http://www.thdl.org/TibetanIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb671269-8e96-44f9-abe7-8f00dff1f7a0/lewis_dot_structures_of_atoms_and_ions_worksheet_answer_key.pdfIn PDF document text
    • https://1094d5c0-a920-47c7-a1de-7e2d56a92d84.filesusr.com/ugd/47b1e8_bacd7227714140d69ddf28fbe1b69ba9.pdf?index=trueIn PDF document text
    • https://1de4b56a-3309-4767-83a2-f1bb1ea7c594.filesusr.com/ugd/a6e5e9_5808d5e671504b5097e448dca5f9716b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/41e28862-994c-41aa-95ff-670193088fbb/the_complete_film_production_handbook_fourth_edition_download.pdfIn PDF document text
    • http://ravizovagusemav.epizy.com/woledugexupagotuxupikiv.pdfIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/sazumebopenop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9804223-56be-4f76-aa8a-90697ab6ac2e/2990543398.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/004d78fe-8250-492a-9dcc-05253d7d69ec/82335705513.pdfIn PDF document text
    • https://s3.amazonaws.com/sefabe/linos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e155f033-10c7-475d-afe2-5345168f5420/22958039184.pdfIn PDF document text
    • https://98be45bc-63b9-4117-aff7-84a3d4f2c4a0.filesusr.com/ugd/90c678_6d390d056a6b486881dc7efb49e3dbe6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wakuzidi/investing_in_shares_for_beginners_nz.pdfIn PDF document text
    • https://502e425a-54a0-4661-a3e6-c6e116bdb13d.filesusr.com/ugd/10da26_d3668397718b4422ae3280e9e140ffe7.pdf?index=trueIn PDF document text
    • http://tumejatamivalu.rf.gd/eras_protocolo.pdfIn PDF document text
    • https://f3dbd103-cf2f-44fc-b0ad-c9004dc38af2.filesusr.com/ugd/1f2646_69e01ea8538c4cf782cec08df0817ca1.pdf?index=trueIn PDF document text
    • https://91c7bc9f-df77-4dbd-ae51-8bcf521f3e61.filesusr.com/ugd/1df9ea_ae82d10078b2441689ad8e467018ba81.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bugutaj/fologatukira.pdfIn PDF document text
    • http://kagiwabiluwotel.epizy.com/coal_power_plant_flow_diagram.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://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlTibetanIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001fbcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FBCB 3992 bytes
SHA-256: 399db811974f6e1db12c35d911c6b5433888e32364326bd0b3915e442ddd3760
font_01_sfnt_off00020b6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20B6C 5400 bytes
SHA-256: 4dcaacd7fbe9d5345e4e9c1d4c86ead90a7a82de9337c819b7bc401dd91c6d4c
font_02_sfnt_off00021dc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21DC6 8976 bytes
SHA-256: 043275fd08f61a242a3987e2d5cd46ead7ad3b0856b8812769e4fb4fd1355f22
font_03_sfnt_off00022f7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22F7D 8180 bytes
SHA-256: f29c13c7432f501ca4298732200ba8ed75da8ea1bf36592cbf6eebed06140d56
font_04_sfnt_off00024639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24639 13652 bytes
SHA-256: 8fc3c334a9de8bf03505a02fb3eae9087def6f95bf6635007ef438cda72c6bd8

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