Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac836a38e7cb3434…

MALICIOUS

PDF

89.5 KB Created: 2021-05-25 16:48:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7d2c9b55e95a7a19f7e8796c5ec25e79 SHA-1: 230dcdf02080fa81f8fad26c40e1ef016515950b SHA-256: ac836a38e7cb3434c2fc25cd0dd0e0b17996839c2b408ae0f6e96277439d72b7
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan. It contains a large number of external links, many of which point to PDF files, suggesting a link farm or redirection mechanism. The primary URL, https://jacksth.ru/strik, is likely used to redirect the user to a malicious site. No scripts were extracted, but the extensive link farm and the ClamAV detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://jacksth.ru/strik?utm_term=how+to+play+forza+horizon+4+offline+pc
    • https://cdn-cms.f-static.net/uploads/4391624/normal_601f23af61620.pdf
    • https://lobovalosidim.weebly.com/uploads/1/3/1/4/131437181/5443472.pdf
    • https://cdn-cms.f-static.net/uploads/4454679/normal_6062291790467.pdf
    • https://waluxine.weebly.com/uploads/1/3/4/7/134759732/majirulanudupiv-wiwowe-nofusodabapidad-siwijamege.pdf
    • https://cdn-cms.f-static.net/uploads/4384036/normal_602c4efad9321.pdf
    • https://guretaximijogu.weebly.com/uploads/1/3/0/7/130739376/6436667.pdf
    • https://jaragamonobuwuf.weebly.com/uploads/1/3/5/3/135346236/14b106c2417b93a.pdf
    • https://sanituwinera.weebly.com/uploads/1/3/1/3/131379206/b61d99127.pdf
    • https://static.s123-cdn-static.com/uploads/4366367/normal_5fc63e79591b8.pdf
    • https://jelozenodi.weebly.com/uploads/1/3/0/7/130739120/gifusate-bumonudiw-tinasegagosi.pdf
    • https://viropozokuputaj.weebly.com/uploads/1/3/4/4/134441516/8146981.pdf
    • https://lanedipeluta.weebly.com/uploads/1/3/4/6/134666686/3175798.pdf
    • https://cdn-cms.f-static.net/uploads/4405437/normal_6035224fa1d32.pdf
    • https://mowasevibipogo.weebly.com/uploads/1/3/1/3/131379904/b7df7.pdf
    • https://fuvedomuwipiw.weebly.com/uploads/1/3/1/6/131636935/2359189.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/mogipegi/vs_code_format_on_save_python.pdf
    • https://uploads.strikinglycdn.com/files/1f3cdd9d-8088-4f81-b3f5-eac52c597939/wordpress_register_without_plugin.pdf
    • https://s3.amazonaws.com/rizoli/48112032998.pdf
    • https://s3.amazonaws.com/litunux/writing_equation_word_problems_worksheet_chemistry.pdf
    • https://uploads.strikinglycdn.com/files/fdb619c0-0f7b-441d-926d-5d4e1e406277/dream_interpretation_dead_mother_smiling.pdf
    • https://s3.amazonaws.com/mejigavukolu/83191583137.pdf
    • https://s3.amazonaws.com/lopadivupudexa/lave_linge_bosch_maxx_5_performance_1200.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a8a.bin
6b44be9d03594c92f390afbf6731a76f09de1e99e69af495da5f1db3364846a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8A 5004 bytes
font_01_sfnt_off00011b9d.bin
ec65ee024c78c62af443fcd32aba5833bb6c4f89159da35fee30b22df50b745b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B9D 1984 bytes
font_02_sfnt_off000124c3.bin
d57a0ae5bb91706428b0a08008e7ddb5671a51e9bd21c67716c3b3df0d4a9018		 pdf-font-stream PDF embedded font (sfnt) at offset 0x124C3 10856 bytes
font_03_sfnt_off000149d3.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x149D3 4324 bytes

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