Malicious PDF — malware analysis report

Static analysis result for SHA-256 16065b7407241edf…

MALICIOUS

PDF

77.0 KB Created: 2021-05-21 14:05:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ade4c9eb50ee2a1aa83d81c38fee559f SHA-1: 94022b9edc5500e4f22da60a7514f53cd644a4a6 SHA-256: 16065b7407241edf0e5063a1a36549d59dd9ae1a743eb3237688ba0ba90b1cb8
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, with the primary malicious URL being 'https://jottigo.ru/strik?utm_term=c+stdin+stdout+example'. This suggests a phishing or malware distribution attempt, likely delivered as a spearphishing attachment. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent.

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://jottigo.ru/strik?utm_term=c+stdin+stdout+example
    • https://vipugexisixow.weebly.com/uploads/1/3/0/7/130775501/nigipafopetiju_wajuku_zewuvub.pdf
    • https://nasabera.weebly.com/uploads/1/3/4/4/134447265/c7645710d1.pdf
    • https://cdn-cms.f-static.net/uploads/4477913/normal_5fd2467037e5c.pdf
    • https://cdn-cms.f-static.net/uploads/4380525/normal_5fe7a764ee4ed.pdf
    • https://kivexobine.weebly.com/uploads/1/3/4/8/134859900/1608428.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/fd675d78-c6a9-4edf-83fb-fb6f0e684553/45886194768.pdf
    • https://uploads.strikinglycdn.com/files/2962295b-53bd-4e08-ac34-5f660b2e3e74/tikivunujopeg.pdf
    • https://uploads.strikinglycdn.com/files/94ae50e4-2a72-43e7-ab96-73c9480094c4/formato_de_mantenimiento_preventivo.pdf
    • https://uploads.strikinglycdn.com/files/47046988-0625-4243-bf14-d7d287773f4a/little_prince_online.pdf
    • https://uploads.strikinglycdn.com/files/d3c4e3ad-5cda-4c21-8c94-f5058d0477a6/7273877665.pdf
    • https://uploads.strikinglycdn.com/files/07b19342-da90-465d-b7d6-5cf0d025fac2/kevex.pdf
    • https://uploads.strikinglycdn.com/files/6cd4d0a0-be83-45ff-b892-99d37a7b8ab4/9382819162.pdf
    • https://uploads.strikinglycdn.com/files/60fba354-8443-43bd-bdb6-563688cd578a/55166289686.pdf
    • https://uploads.strikinglycdn.com/files/16f28cc8-ca13-45c7-aacd-4d7aaf3c1e07/hx_stomp_vs_real_pedals.pdf
    • https://uploads.strikinglycdn.com/files/1cdfef5c-c584-48e9-831b-41a40e677c7c/c_programming_tutorial_in_turbo_c.pdf
    • https://uploads.strikinglycdn.com/files/abdddc07-bfe5-4fc3-962e-c25f8ae049a6/pigazod.pdf
    • https://uploads.strikinglycdn.com/files/6ff7a371-5122-447c-bc69-66b0fca88ad1/bolabebexajakizuwudikun.pdf
    • https://uploads.strikinglycdn.com/files/b9afa512-4d21-4804-9f05-bbe61447985d/how_to_tie_a_movable_knot_for_a_necklace.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee9a.bin
2754d06473c591f8ab5f34db6e603f38a8a59a1986db5e33c33f7cc8b364d2e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9A 4984 bytes
font_01_sfnt_off0000ff75.bin
d8df14d42b4a1b0b065f46fb08aad3577c7c42a1c90c7435d912a41f66d551e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF75 11572 bytes

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