Malicious PDF — malware analysis report

Static analysis result for SHA-256 db7d82b8962eb114…

MALICIOUS

PDF

71.2 KB Created: 2021-06-09 10:02:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a18a792c1b8e6264c575d48786c0aa22 SHA-1: e2a1e36bf8e7dfc4dc52aca6730afa68e9cb28a2 SHA-256: db7d82b8962eb11451c638826c6e925d9829d6245450546bceb1e5da60db783d
156 Risk Score

Malware Insights

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

The PDF document contains a lure related to 'New version gb instagram' and exhibits characteristics of a phishing or link farm attack, as indicated by the PDF_SEO_LINK_FARM heuristic and numerous external URLs. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coretry.ru/pbw?utm_term=new+version+gb+instagram
    • https://xikagarema.weebly.com/uploads/1/3/4/4/134489929/e465245e.pdf
    • https://xezaresirut.weebly.com/uploads/1/3/4/7/134712286/buwak.pdf
    • https://velazidolis.weebly.com/uploads/1/3/0/9/130969689/51dad8534fb268.pdf
    • https://static.s123-cdn-static.com/uploads/4483104/normal_5fcd275f3f4fa.pdf
    • https://static.s123-cdn-static.com/uploads/4463300/normal_5fc9891a30f40.pdf
    • https://filekudop.weebly.com/uploads/1/3/4/0/134017403/f957e.pdf
    • https://static.s123-cdn-static.com/uploads/4466146/normal_5fc6025934d2b.pdf
    • https://cdn-cms.f-static.net/uploads/4488339/normal_60bde4f526fdf.pdf
    • https://dasiwijumajofep.weebly.com/uploads/1/3/0/7/130739595/pawigim-lavopipaviwumi.pdf
    • https://static.s123-cdn-static.com/uploads/4384470/normal_5fef888e57f24.pdf
    • https://fubuworarakej.weebly.com/uploads/1/3/4/1/134108970/tananaxojetat.pdf
    • https://cdn-cms.f-static.net/uploads/4499002/normal_6066093873d24.pdf
    • https://static.s123-cdn-static.com/uploads/4387928/normal_5ffa7aad28dbb.pdf
    • https://wotipufa.weebly.com/uploads/1/3/1/0/131069738/1359853.pdf
    • https://nulesurusisozi.weebly.com/uploads/1/3/4/7/134744420/2857136.pdf
    • https://static.s123-cdn-static-d.com/uploads/4482207/normal_60b1b8eb831fc.pdf
    • https://static.s123-cdn-static.com/uploads/4450907/normal_6000923ae7c9b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/384e19af-01e7-4079-bc3e-471489dfd308/20164584344.pdf
    • https://uploads.strikinglycdn.com/files/c212e81e-406a-4f15-af30-2572099e15de/how_to_draw_out_a_tooth_abscess.pdf
    • https://uploads.strikinglycdn.com/files/bc652ffb-0937-4743-b272-2b35c2c0fd52/test_organizacion_politica_y_administrativa_del_ayuntamiento_de_madrid.pdf
    • https://uploads.strikinglycdn.com/files/249f251b-b7c7-4a4a-88da-5241bfc7fc48/share_market_holidays_august_2020_india.pdf
    • https://uploads.strikinglycdn.com/files/e002f784-f7d2-48f6-806f-2b54ccdec96a/50631237559.pdf
    • https://uploads.strikinglycdn.com/files/c7e1f6e5-79fe-48a0-95a1-c8fb0c236a55/94340416890.pdf
    • 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_off0000d9a4.bin
129946aabdae8a156a73dbd93edf9d80a32387471aa398361eb485d119b996d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A4 5236 bytes
font_01_sfnt_off0000eb7d.bin
d91adade161fdc850c89caefed545ce807e290df1c8e4e84b072358573db9147		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7D 10528 bytes

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