Malicious PDF — malware analysis report

Static analysis result for SHA-256 c98fe1be88befbae…

MALICIOUS

PDF

74.9 KB Created: 2021-03-28 09:23:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7cd2f0dcdffe9a3c95ccdad95efb0770 SHA-1: a323b0186bfdecb9b3c636c74c3971eddfe5d93a SHA-256: c98fe1be88befbae5abdfefe4bc0975329684ab13984ebbdfb18cde7678411c1
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, which is a common tactic for SEO manipulation or directing users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://soxebez.ru/123?utm_term=airdrop+alternative+for+android
    • https://cdn.sqhk.co/juvekuvop/ifjfQgg/it_events_december_2019.pdf
    • https://fakipaga.weebly.com/uploads/1/3/1/1/131163599/8643951.pdf
    • https://cdn-cms.f-static.net/uploads/4466666/normal_6039b38d6b5f5.pdf
    • https://static.s123-cdn-static.com/uploads/4407299/normal_5fdf4eda37793.pdf
    • https://zumaboletafu.weebly.com/uploads/1/3/1/4/131454272/zibopakikatux.pdf
    • https://cdn.sqhk.co/gapebeve/pggQn4L/balance_ball_3d_game_download.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://476bd0ee-6fcc-4883-9008-ab3df93dc9e0.filesusr.com/ugd/cac9e4_f78ed66829cf41c486e48aded1f66cfb.pdf?index=true
    • https://c370dac7-4848-4fa0-a6df-94361299e8ba.filesusr.com/ugd/fa6303_5d09f1d5e6dd49008addb75f90966550.pdf?index=true
    • http://zujebagita.epizy.com/3034502795.pdf
    • http://rozunaxomibow.epizy.com/63631258342.pdf
    • https://s3.amazonaws.com/sirilagewuga/98175414727.pdf
    • https://s3.amazonaws.com/zuwosil/powerpoint_material_design_template_free.pdf
    • https://b00f38ea-0d13-4519-ab0f-1253f0d03ca0.filesusr.com/ugd/289c5e_af7472b4f44549a88d9c0e35cb1e27b1.pdf?index=true
    • https://79e8b926-cc52-4cef-90ae-68e3990d752e.filesusr.com/ugd/694d5d_e462ae14cf964c48973741c9d7d0d37d.pdf?index=true
    • https://s3.amazonaws.com/ganubifirigevi/zunexezikofudoxika.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da98.bin
43a16a655a6d6bcc29882f4d62619720827ee167c80f956635a1abea9b5a2ce6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA98 4692 bytes
font_01_sfnt_off0000ea99.bin
f7816241681739a863bb52f854ecc9aa6b27f56476ba9ccd0b3ad94c1028c2cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA99 10608 bytes
font_02_sfnt_off00010ea5.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA5 4324 bytes

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