Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf53f36446e14754…

MALICIOUS

PDF

74.4 KB Created: 2021-02-19 09:50:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: d57476aca24b6c03f2529aeeb4f7c839 SHA-1: 45303e06818a9b3dcdd1b8c2d93399167167a0cc SHA-256: cf53f36446e147547fda76bf3656e828da8d92cd5452413f6f0ed9e2a39b6e92
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many pointing to S3 buckets and other domains, suggesting a link farm or SEO spam operation. One prominent URL, 'https://leonvi.ru/wix?keyword=camden+county+nc+towns', is embedded within the document body, indicating a potential lure for users searching for local information. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://leonvi.ru/wix?keyword=camden+county+nc+towns PDF link annotation
    • https://cdn.sqhk.co/nagebagem/hhgmvhi/vamirijigegotoputovis.pdfIn PDF document text
    • https://cdn.sqhk.co/wugunifikezu/hjR6yYd/91954807407.pdfIn PDF document text
    • https://cdn.sqhk.co/mawejoxejobe/fFgfhjp/65750704085.pdfIn PDF document text
    • https://cdn.sqhk.co/dixufeja/fRihdRm/lol_remix_dolls_kitty_k.pdfIn PDF document text
    • https://cdn.sqhk.co/vemegunir/yPijjiY/zijomeweselasuguneb.pdfIn PDF document text
    • https://nagiwudulowep.weebly.com/uploads/1/3/0/7/130775657/743300.pdfIn PDF document text
    • https://faripolugariwel.weebly.com/uploads/1/3/1/4/131453512/d50c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450151/normal_5fda8d50dbe6a.pdfIn PDF document text
    • https://cdn.sqhk.co/wugoxoxowex/hjdrRqo/best_escape_room_games_steam.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/forupokisip/38196699176.pdfIn PDF document text
    • https://s3.amazonaws.com/lulelepese/bofapokuneroxazizozojugo.pdfIn PDF document text
    • https://s3.amazonaws.com/megujobemegor/information_about_railway_station_in_gujarati_essay.pdfIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/xaxukifaveriturozozibijam.pdfIn PDF document text
    • https://s3.amazonaws.com/rijaliwiguvex/79846990696.pdfIn PDF document text
    • https://s3.amazonaws.com/dejazuvorira/android_one_update_august_2019.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e69a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69A 5056 bytes
SHA-256: 69da427f4d2e1e68cca431f3b59cc60fea7dd169ec24e7f83cfe907b7f410570
font_01_sfnt_off0000f7cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CF 10816 bytes
SHA-256: e5a9bf3d18c3d0cc267f867c5fcf8499d5ce2f500aece6c57738222b41175815

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