Malicious PDF — malware analysis report

Static analysis result for SHA-256 cad13756b0faa426…

MALICIOUS

PDF

71.5 KB Created: 2021-03-20 13:46:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9b261fe1259c43f70b78e298aefc3c6e SHA-1: 7cf19660807c0f1b1d25ce67d094070ea429c30d SHA-256: cad13756b0faa426451e082f0eec4f5e220e8f34ad11bb50033b8fa694f586cd
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application T1059.007 JavaScript

The PDF document exhibits characteristics of an advance-fee scam, using lures related to lotteries or parcel deliveries. It contains a large number of external links, many pointing to PDF files, suggesting a link farm or SEO poisoning tactic to distribute malicious content. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs further supports a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://seumenha.ru/wix?keyword=bangkok+grill+covington+ga
    • http://lasns.fun/bushnell_neo-_x_golf_gps_watch_manualzzbww.pdf
    • https://poperetaro.weebly.com/uploads/1/3/4/8/134893078/zupedovude.pdf
    • http://goproits.com/tipanolalamogikekamfwjjs.pdf
    • https://cdn.sqhk.co/benibavagoge/B0jiifY/desejibabobizuzetipajofo.pdf
    • https://cdn.sqhk.co/mabisurud/jfjdhdX/46914442373.pdf
    • https://ramokazadi.weebly.com/uploads/1/3/4/4/134470245/fitimin-satisowuv.pdf
    • http://cafechorsu.ru/58135371880axpvz.pdf
    • http://vannabanyavsedela.xyz/ruguzajimugemolesezusakawlvprm.pdf
    • https://vetetomo.weebly.com/uploads/1/3/4/0/134000119/bb7176c7b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/muwemivumazulax/todujowira.pdf
    • https://s3.amazonaws.com/zuxime/16013172912.pdf
    • https://9e1b5e4e-b4ab-405b-8fdf-b3b6d7b19c28.filesusr.com/ugd/94ea38_7cf77786890242009c1652d16c7b148a.pdf?index=true
    • https://s3.amazonaws.com/jepinebawo/blow_horn_ringtone.pdf
    • https://8b7199fc-a029-4910-8138-caee300d1cbd.filesusr.com/ugd/da8f68_85cfd8d8897946c7ba6fda9cd67aa577.pdf?index=true
    • https://cd9ed9ec-87d1-42be-9198-0b2de6c1db4d.filesusr.com/ugd/158fb9_e8a31f3a6ad34bbba0836be6f6dfbe23.pdf?index=true
    • https://s3.amazonaws.com/ragejufa/long_tailed_lizard_care_sheet.pdf
    • https://s3.amazonaws.com/sixenogafopoj/26143760862.pdf
    • https://daa3fa8b-da82-45f0-bc95-0c5ba2dea5f4.filesusr.com/ugd/bf07b1_6f7d6814928346e4a5220c9f18579e5c.pdf?index=true
    • https://ba789de2-c385-43ee-b32d-a34c698d1993.filesusr.com/ugd/b7082a_9d8a58d545f549e98d720c8d6495229f.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dae3.bin
9d7bb789342fe16ae8a2a072ba23d6460914463ce5ddb9380cfc592a263dcb42		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE3 4960 bytes
font_01_sfnt_off0000ebe5.bin
eee46f83e86fa5adfba85770f7a76f619a5aa37e3e3374d277924093ad77c48c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE5 10848 bytes

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