Malicious PDF — malware analysis report

Static analysis result for SHA-256 b83870d095474cf3…

MALICIOUS

PDF

89.0 KB Created: 2021-05-28 14:25:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: e9f7089e1c03459dc5e948f51fa40bc4 SHA-1: 50eedd8202075c407e3aa429a09dc6bcf2121505 SHA-256: b83870d095474cf34668d979953af6e4c754cfbaf026d376de45b82ddd81ddd4
156 Risk Score

Malware Insights

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

The PDF contains an embedded URL that directs users to a website offering 'Vpn android 2. 3. 6 free', which is likely a lure for phishing or malware distribution. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, suggesting a link farm designed to manipulate search engine results or distribute malicious content. ClamAV also detected this file as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://jottigo.ru/123?utm_term=vpn+android+2.+3.+6+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4475383/normal_601f25be13313.pdfIn PDF document text
    • https://zotabuja.weebly.com/uploads/1/3/4/5/134510490/kesuxiw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378834/normal_604ecdc12638e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501057/normal_602ab59877c09.pdfIn PDF document text
    • https://nusosujorogu.weebly.com/uploads/1/3/4/5/134589145/sigovemufopakuxokiz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426280/normal_6036b16e34b74.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423137/normal_605a580e3c0f0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457298/normal_5fe2cddbed4d8.pdfIn PDF document text
    • https://wuwepila.weebly.com/uploads/1/3/4/3/134371533/405dfd159b7c9c1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427282/normal_5ffbfed34e99f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465709/normal_5fe25c9d7ba0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374978/normal_604a30d421586.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488102/normal_5fd079a70cb12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472200/normal_60219b5463903.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408476/normal_5ff46d938c04b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412573/normal_602bf4708bfa6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a09174c0-60f6-4b02-97e3-bf15abbc5c4e/what_questions_should_i_ask_when_buying_solar_panels.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b45e2625-e450-4881-9e25-f10bb00e9151/40962458993.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6654e5b-a4f9-41c5-b977-b64c83273516/metodo_simplex_ejercicios_resueltos_maximizar_y_minimizar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9eb369de-9c5d-49a7-90fd-e0281c2d30c3/social_emotional_worksheets_for_kindergarten.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e70b78e-041a-4048-a5e6-414f990e70dd/43342091357.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b6ac09b-cec4-4848-ab0a-b4f9c49622c1/ios_soft_dev_pack__jb_ios_7.1_v2.exe_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ddac01d-f834-403b-8ea6-c961c5122ee0/94018923668.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000109a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A7 5272 bytes
SHA-256: e5e5a36c90fc79b8b12d9481add25e1976f275a550bac8fcc6cbd23d7429cc55
font_01_sfnt_off00011bb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB6 11596 bytes
SHA-256: b1d1830084eea10c3370a1d8f21f535090a1d2996d5ede0251f878d163c2c3b5
font_02_sfnt_off0001420b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1420B 16036 bytes
SHA-256: 35d3440dae1ebc896564e4e6f70ea95aa3a30a1ac603c7fffbb21b68b8b72e2f