Malicious PDF — malware analysis report

Static analysis result for SHA-256 93f737c20f7ab40a…

MALICIOUS

PDF

99.6 KB Created: 2021-03-20 02:36:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 74b7663b9e3ab0f1a8be8e7d4917ba66 SHA-1: 3ae8bc6ea7c51d3925c90c59477c166d16d485af SHA-256: 93f737c20f7ab40ae56f18c4b8dde589225a1d879367f313b45a4de7864bd58d
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, indicating it functions as a link farm. This is a common technique for distributing phishing lures or redirecting users to exploit kits. The ClamAV detection and ML classifier further support its malicious nature, likely for phishing or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/award?keyword=proyecto+de+investigacion+cientifica+pdf PDF link annotation
    • http://pusatokolerax.mywebcommunity.org/babajonorowixi.pdfIn PDF document text
    • http://lipuwisapi.mywebcommunity.org/agent_agreement.pdfIn PDF document text
    • http://majijeniwadimu.22web.org/free_printable_bi-_weekly_budget_worksheet.pdfIn PDF document text
    • http://sesizuxewewax.mygamesonline.org/can_you_do_istikhara_on_your_period.pdfIn PDF document text
    • http://barajofa.mywebcommunity.org/kesijiwemolalo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://kujujigufa.epizy.com/20884605046.pdfIn PDF document text
    • https://d2497fa9-5496-4194-9764-f4b168485e88.filesusr.com/ugd/eed259_5adb57cf13d249ca82fd20ec8cec6ec0.pdf?index=trueIn PDF document text
    • https://6a24fdd2-d4a5-4c4b-882b-0f3115751bcf.filesusr.com/ugd/04e6f9_9e9387be96c046728224d5f3b1adb19a.pdf?index=trueIn PDF document text
    • https://a80c0318-1640-4d50-a016-df037fc402b9.filesusr.com/ugd/895bef_58b98823d740477890a7840526b9398e.pdf?index=trueIn PDF document text
    • https://3568c1c9-c281-4b9a-9ea9-d5d291e0176b.filesusr.com/ugd/e5d8db_74c5ec0b10364a18939417a7eb48efb6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/memobofilenabon/application_insights_alerts_arm_template.pdfIn PDF document text
    • https://041aa876-b65b-432c-96c0-58c8b295a4e4.filesusr.com/ugd/90d19e_b4b2fa99451b40b4a4981e60468690db.pdf?index=trueIn PDF document text
    • https://ddf64d59-5240-4154-9987-17dfc28e22c7.filesusr.com/ugd/cec570_4ba625d524fa4b68b5c7f2e9f861a0c2.pdf?index=trueIn PDF document text
    • http://rujesuluxure.rf.gd/comprehensive_chemistry_book_class_11.pdfIn PDF document text
    • https://80820154-e864-4b0c-832b-212b24169927.filesusr.com/ugd/c12414_6b9520af2de541ab9a5276a2cd182b8e.pdf?index=trueIn PDF document text
    • https://11484d69-1612-41b9-9199-165df1f08223.filesusr.com/ugd/e2f197_bfe4a23519da48d7a78b0d4e54832a05.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/naxizugenabi/parolotupezina.pdfIn PDF document text
    • https://s3.amazonaws.com/moduluzuxikari/43887929538.pdfIn PDF document text
    • https://9e0ebcba-7e04-41ac-afc6-cfc574163c15.filesusr.com/ugd/6725b5_c9eeb6a7366f4145a774ba16ee7e62b9.pdf?index=trueIn PDF document text
    • https://507d1b22-ea03-4061-a262-f79425337ca2.filesusr.com/ugd/a374b9_5e5c691850d3437a928df9e46e4fd7c7.pdf?index=trueIn PDF document text
    • https://4095172d-bd2f-4181-91d7-dd424e653400.filesusr.com/ugd/df73ab_696bba11ea0e4cddbe30bd9724d33719.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13815 5244 bytes
SHA-256: cc386e289dbb8bf6082660ef43c7c29e4dbeb7954107bdd5aba7c92c5c9cd39d
font_01_sfnt_off00014a03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A03 11936 bytes
SHA-256: 331fc8c536516230ce4634c7ea0a717118691aa2c9fa6ca2183e93951c477986
font_02_sfnt_off0001710f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1710F 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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