Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ce2a65a47f80a44…

MALICIOUS

PDF

79.7 KB Created: 2021-02-21 15:23:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: e42de9f0528f34e5b3ac08236132a7c6 SHA-1: 0a628b4362d50d5f67e081f8474b685d8a83c628 SHA-256: 1ce2a65a47f80a448259e834faf0f7183b442cea95a041bea8a9998d10b04952
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically a phishing or trojan payload. The embedded URLs, such as 'https://baarspo.ru/strik?utm_term=how+to+get+a+hawaii+tax+id+number', are likely used to redirect users to malicious content.

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://baarspo.ru/strik?utm_term=how+to+get+a+hawaii+tax+id+number PDF link annotation
    • https://bovuzujavus.weebly.com/uploads/1/3/5/3/135326818/musalekezupuro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459641/normal_602ed31349528.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388037/normal_5fed3af0d0ad1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455185/normal_60143cb51117b.pdfIn PDF document text
    • https://mitesevutij.weebly.com/uploads/1/3/4/7/134717039/6586411.pdfIn PDF document text
    • https://xudapunazegiwav.weebly.com/uploads/1/3/2/7/132741045/bivurutudanuved-newad-fonoviw.pdfIn PDF document text
    • https://cdn.sqhk.co/buxifuludo/XjahddV/grand_theft_auto_3_xbox_360_controller.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455180/normal_5fd17f6a3d976.pdfIn PDF document text
    • https://modevidiwuwos.weebly.com/uploads/1/3/5/3/135318048/xonizukebepiz-raworex-katujade-vebalugel.pdfIn PDF document text
    • https://tipuzivi.weebly.com/uploads/1/3/0/9/130969377/dologetipotir_vepebenafez_zorivud_wosogomilojodu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378410/normal_5fce9c558a7aa.pdfIn PDF document text
    • https://puvugemamoj.weebly.com/uploads/1/3/0/9/130969199/5993074.pdfIn PDF document text
    • https://pobunusegem.weebly.com/uploads/1/3/4/4/134460984/1470427.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405202/normal_602d4b4a18183.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/taturi/pifujefugifupezuri.pdfIn PDF document text
    • https://s3.amazonaws.com/besafefaf/kerala_onam_bumper_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/payzapp_apk_3.pdfIn PDF document text
    • https://s3.amazonaws.com/penale/technical_drawing_for_fashion_a_complete_guide.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE66 5172 bytes
SHA-256: d268ad1db25a39e599d56a1e6b2e51281652e2f2685bd894233ec7de2c2e2e1b
font_01_sfnt_off0000ffd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD9 10252 bytes
SHA-256: 0d40f7d9daaa9935faa529015b097f0d62aebf8b64665b228a80bb3919b0fe90
font_02_sfnt_off00012303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12303 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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