Malicious PDF — malware analysis report

Static analysis result for SHA-256 43f165ddbf68ad1e…

MALICIOUS

PDF

83.1 KB Created: 2021-05-25 00:10:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: affa477d6c4afafa64e991337ec3aae9 SHA-1: 60f385de4a293b11be471a98575b0cea4e45beda SHA-256: 43f165ddbf68ad1e8332326c7f39f16e38f99be630ce329da0def0081828d835
156 Risk Score

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 Weebly-hosted PDFs, suggesting a link farm or redirection scheme. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically a phishing or trojan payload. The embedded URLs, such as 'https://dafemum.ru/strik?utm_term=w3schools+python+book+pdf', are likely used to redirect users to malicious content, potentially exploiting PDF vulnerabilities or delivering further malware.

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-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://dafemum.ru/strik?utm_term=w3schools+python+book+pdf
    • https://xawiwewediwo.weebly.com/uploads/1/3/4/0/134017039/lilezamirawaj.pdf
    • https://kanemonel.weebly.com/uploads/1/3/5/3/135319287/xeratu_kepofawi_mibasera_mibagixizaxo.pdf
    • https://xisegebimir.weebly.com/uploads/1/3/4/3/134340076/74176.pdf
    • https://biposekiz.weebly.com/uploads/1/3/5/3/135349949/vatipakazezi-sosododexavex-karudi-ganowide.pdf
    • https://negowuvezesat.weebly.com/uploads/1/3/4/8/134859399/1171230.pdf
    • https://nakotugobal.weebly.com/uploads/1/3/5/3/135300729/pafemolarojove.pdf
    • https://lilawowawumoxo.weebly.com/uploads/1/3/1/4/131453384/fenexu_limumexajafelu_wadetewar_sagunubuzo.pdf
    • https://jotegeposopema.weebly.com/uploads/1/3/4/7/134743683/tefapifutesumi.pdf
    • https://netodidomaxamoz.weebly.com/uploads/1/3/4/3/134311991/69e62cdfe3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/mubemutolewe/cfpb_hmda_guide_2019.pdf
    • https://s3.amazonaws.com/vudivuzakal/pexetategefudidagov.pdf
    • https://uploads.strikinglycdn.com/files/69d1ea3f-daa9-4de0-8e97-3d2ad21799f6/fejom.pdf
    • https://s3.amazonaws.com/dixaleko/37886191024.pdf
    • https://uploads.strikinglycdn.com/files/c8aceaf5-dca6-4d1a-a25f-55e94452ff6f/72408471781.pdf
    • https://s3.amazonaws.com/jenagubadopi/64377134642.pdf
    • https://s3.amazonaws.com/legobegutulo/lobariso.pdf
    • https://s3.amazonaws.com/kikunojulejuj/tutorial_autocad_2016_3d_bahasa_indonesia.pdf
    • https://uploads.strikinglycdn.com/files/6324f489-2fb2-4d6d-8656-9a837d9fd03c/nevowijixirumiruxominezik.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_off0000f946.bin
c4beeaa46fd67a27b27280852f3f60c26bd252512bbb7643e9b9580a6cad6b5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF946 5040 bytes
font_01_sfnt_off00010a6f.bin
03d68f1b4f6d33e16f250ad7679a1abb93498b6610cdd82203d887af25001711		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6F 11408 bytes
font_02_sfnt_off0001314d.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1314D 4324 bytes

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