Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cbb540cd56e1315…

MALICIOUS

PDF

82.4 KB Created: 2021-05-15 12:09:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 656c573cef8c8d9ee598992b4eaf7f0c SHA-1: aa8e0f822934227d5b5da8ef7ee2ed0bf7839e2e SHA-256: 1cbb540cd56e1315d90d420f253a02bb186250b9420e317fb46ce27f586640cf
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to PDF files, suggesting a link farm or a method to distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

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://druttle.ru/strik?utm_term=how+to+use+ti-89+titanium+calculator+for+finance
    • https://cdn-cms.f-static.net/uploads/4494681/normal_6013cbd425ab8.pdf
    • https://lafowujokunoro.weebly.com/uploads/1/3/0/7/130738997/gijenire.pdf
    • https://cdn-cms.f-static.net/uploads/4482206/normal_5fd98a8278c20.pdf
    • https://cdn-cms.f-static.net/uploads/4501214/normal_601bad32a5fd6.pdf
    • https://static.s123-cdn-static.com/uploads/4383565/normal_5fcbdb30a9d05.pdf
    • https://cdn-cms.f-static.net/uploads/4408352/normal_6021502b13c1a.pdf
    • https://safalijig.weebly.com/uploads/1/3/1/0/131070993/5653634.pdf
    • https://static.s123-cdn-static.com/uploads/4387816/normal_5ff03f77aca9c.pdf
    • https://static.s123-cdn-static.com/uploads/4390350/normal_5fde08d821809.pdf
    • https://cdn-cms.f-static.net/uploads/4387235/normal_603e162add79b.pdf
    • https://cdn-cms.f-static.net/uploads/4459788/normal_604b4cf89dd9a.pdf
    • https://cdn-cms.f-static.net/uploads/4454670/normal_606e3137e0bd3.pdf
    • https://cdn-cms.f-static.net/uploads/4390056/normal_604d141eccc8e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/727b7745-1cf3-4f2e-9916-e0bf49b38055/nespresso_lattissima_touch_guide.pdf
    • https://uploads.strikinglycdn.com/files/46d24d07-748a-437a-ba3c-ef765a3470a6/what_is_void_contract_in_hindi.pdf
    • https://uploads.strikinglycdn.com/files/dcbea04c-79fc-4765-93f3-d91466948d27/13791933959.pdf
    • https://uploads.strikinglycdn.com/files/faa4bff1-fbaf-4744-8156-ee86455698f0/67456512893.pdf
    • https://uploads.strikinglycdn.com/files/b05d8f6f-d923-4045-ab19-ed0dd0649946/name_the_instrument_used_to_measure_rainfall_class_7.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_off0000f73f.bin
3e3bcfc2d6e048d91b4a87bba43f7dd59f607cf5fa192c943795599de728bf56		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF73F 5344 bytes
font_01_sfnt_off00010960.bin
9e6047908e083a771db86d1125fb7df6d0138ec7c13ecbe6a5aa81ae4533216e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10960 10732 bytes
font_02_sfnt_off00012e37.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E37 4324 bytes

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