Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a9cf7fb9af6e4fe…

MALICIOUS

PDF

82.7 KB Created: 2021-03-16 18:42:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 73b341dae91e21b0df15cffc22f6b8d0 SHA-1: 17d41a472d14c9ee9055514700c2997d5d2b7b9d SHA-256: 8a9cf7fb9af6e4fea8fb94d051c438187b5cfae325c2d1556ea687b6f5a2990f
186 Risk Score

Malware Insights

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

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 0.9998

Heuristics 6

  • 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 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://kuzutuzo.ru/wix?keyword=ezgo+rxv+service+manual+pdf PDF link annotation
    • https://cdn.sqhk.co/jusulikipe/Ohjib3O/diamond_digger_saga_level_1724.pdfIn PDF document text
    • https://cdn.sqhk.co/rebibenizuj/hijit22/vamavixodajabiw.pdfIn PDF document text
    • http://wisitens.online/475017402758nknf.pdfIn PDF document text
    • http://dewisazovuvoxi.mywebcommunity.org/bow_tie_cinemas_trumbull_showtimes.pdfIn PDF document text
    • http://online-sistem.site/apc_back-ups_350va_230v_iecifbrw.pdfIn PDF document text
    • https://cdn.sqhk.co/kevovevude/0M6whje/sogudomoxi.pdfIn PDF document text
    • http://serovakarara.mygamesonline.org/bob_evans_nutrition_everything_breakfast.pdfIn PDF document text
    • http://wativeb.mypressonline.com/mosca_blanca_bemisia_tabaci.pdfIn PDF document text
    • http://twobigs.space/ejemplo_de_texto_especializadocu94i.pdfIn PDF document text
    • http://remontlegko.info/jesuxup9a6ue.pdfIn PDF document text
    • https://cdn.sqhk.co/dunuxorigu/iYieYhf/cisco_catalyst_2960-_x_series_switches_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/nasanoroge/jc2PhjS/22585284730.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://03f57db0-fbcf-46ec-8713-21b5992b8512.filesusr.com/ugd/455f95_6682ee3c86d24d1990f81cedc85446cf.pdf?index=trueIn PDF document text
    • https://86042ffc-9b62-460b-8552-fb2522205a17.filesusr.com/ugd/4f92c1_669600c4e1ba43dbb58664bd35e59542.pdf?index=trueIn PDF document text
    • https://d6d3a1c5-32ce-46e9-ae92-c5b8d84d65d9.filesusr.com/ugd/a3b54b_3f066e2726724c8a8350af726898d585.pdf?index=trueIn PDF document text
    • https://c8a164a7-2549-4056-b209-d27d417f800b.filesusr.com/ugd/136d3d_58c005dbdabf496d957e51aca8e0e70d.pdf?index=trueIn PDF document text
    • https://a22c3535-4c29-4f26-bf6b-1e631d3648e5.filesusr.com/ugd/28986c_d2e3dcd9ec3045dc827705e5aa6c56d2.pdf?index=trueIn PDF document text
    • https://e4fb9bf1-a3d6-4767-9bf2-2a1021e5dc09.filesusr.com/ugd/53cfc7_4f5c4d858db74bdfaa9e11371704be4d.pdf?index=trueIn PDF document text
    • https://05efeaee-ea5b-4dc8-bddc-a5098cc0dcbd.filesusr.com/ugd/c06c30_3c0678f6ad25483f86c9c9e5c037b611.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0F 2828 bytes
SHA-256: 85b692c1c636aed9ab1240d2a7361179fdd6c0849396a06064984f922e967b4f
font_01_sfnt_off00010809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10809 5608 bytes
SHA-256: 3d2c948e2596f0d1b905ba6e1a1ef109c6e569dc7ce167a4b09818dc83f97284
font_02_sfnt_off00011b22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B22 10052 bytes
SHA-256: 554b3078ee9e0c77fb68aa08792996325c0b270073f12e28ab64ff2ac2dac7d0

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