Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae4008c4a57e39b1…

MALICIOUS

PDF

87.0 KB Created: 2021-03-19 07:44:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 98fdd65187abadf19cdf3a4cfa2bc261 SHA-1: 8df137fc6bc322f52990a71072375f0a5f92dbe0 SHA-256: ae4008c4a57e39b11d17f55633399e93c588ff587a336bd640935e21efd62b98
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm designed to redirect users. The presence of a URL with a 'keyword' parameter suggests a potential phishing or SEO poisoning attempt. ClamAV and ML classifiers also flagged this PDF as malicious, supporting the assessment of a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://xezojetit.ru/wix?keyword=sideload+vr+apk+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465907/normal_6047fdac2262b.pdfIn PDF document text
    • https://fikuzafunowu.weebly.com/uploads/1/3/1/8/131857523/7d730b.pdfIn PDF document text
    • http://japuwakimawod.iblogger.org/abcs_of_safe_sleep.pdfIn PDF document text
    • http://fovijivil.iblogger.org/72874384813.pdfIn PDF document text
    • https://xojakonokixamu.weebly.com/uploads/1/3/1/1/131164577/9bf51f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408596/normal_5ffd9cb434a03.pdfIn PDF document text
    • https://fivujage.weebly.com/uploads/1/3/4/3/134316273/xoviduwunu.pdfIn PDF document text
    • https://dibuponabax.weebly.com/uploads/1/3/4/3/134340508/4120722.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378378/normal_6025a826f091a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6f81cef9-66a2-447d-9e1d-4c0427ef15c5.filesusr.com/ugd/4d935e_5c4caf139fbd476aaf23e6d6c494a2c3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jeromisixinolib/mixivexofivosuxon.pdfIn PDF document text
    • http://xeravujowa.epizy.com/67237130741.pdfIn PDF document text
    • http://nufewusuk.rf.gd/free_indesign_flyer_templates_for_mac.pdfIn PDF document text
    • https://95fbbc11-640f-4658-acdf-6e09da746871.filesusr.com/ugd/e42ee3_977f3c351e2646c085261a10f8c79e7c.pdf?index=trueIn PDF document text
    • https://ce3a146a-d504-4efb-981c-4593fb85d965.filesusr.com/ugd/5b5da7_bb0a8c57af9541b2b72ef0b021eda4ae.pdf?index=trueIn PDF document text
    • https://2a4c341d-9af7-4f89-b48a-1b926ad6ced7.filesusr.com/ugd/dd6616_50b16cac557649319347778d879271b7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/megujobemegor/86557603602.pdfIn PDF document text
    • https://fad58b31-c538-4d3f-828d-7998eec853b9.filesusr.com/ugd/7e6083_0768c877f6b14d77984a445ff31a6318.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zemunomipazikez/wapking_java_games_free.pdfIn PDF document text
    • https://7ef7ebf0-bcb0-4ca2-8538-5a19c3e9f01c.filesusr.com/ugd/aff7ca_56c8276d045f4e68908d2c6b12ce5606.pdf?index=trueIn PDF document text
    • http://fujesotes.epizy.com/vidmate_apk_free_new_version.pdfIn PDF document text
    • https://e25b5f36-ee09-4010-8803-019b2853a23b.filesusr.com/ugd/c34eac_5d5d440fc0e84101a6d89e05d373d45d.pdf?index=trueIn PDF document text
    • https://8909b315-4d59-4940-aabf-0fdaa532e0ad.filesusr.com/ugd/4542d9_8958c3f557494048b78566f3fe69757b.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11686 5096 bytes
SHA-256: e3bc2807d7e1c56b267bd02c088961434f3ec55f26da722ab3d13f063f91bca5
font_01_sfnt_off00012800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12800 10976 bytes
SHA-256: 9e7915bc65933adee42a69ac253447cf84d4c18f3e7450a6b65e7a65e0ff68e1