Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b7594798b1df09f…

MALICIOUS

PDF

87.0 KB Created: 2021-04-18 10:55:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 13fc8b1d3fad85f0f7ec38ae1afb25d4 SHA-1: 28acf3ee517f98bbd0ba03969142bf07afd6011c SHA-256: 7b7594798b1df09f8f7c6c1a129b5e2e5917fd83d870be17f41b63f1a42204dc
126 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that redirects to a link farm, a common tactic for phishing and malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, further suggesting malicious intent. The ML classifier and ClamAV detection strongly indicate this PDF is malicious, likely a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://leonvi.ru/strik?utm_term=napoleon+hill+books+pdf+free+download PDF link annotation
    • https://vatedubajepe.weebly.com/uploads/1/3/4/3/134371970/majojewegim.pdfIn PDF document text
    • http://lomuwugevona.getenjoyment.net/22348863652.pdfIn PDF document text
    • http://tukomibewi.getenjoyment.net/abductor_strengthening_exercises.pdfIn PDF document text
    • https://gabodubelekopo.weebly.com/uploads/1/3/4/3/134356924/a2c9cee.pdfIn PDF document text
    • http://komozazene.getenjoyment.net/85457520413.pdfIn PDF document text
    • http://zijozarub.mygamesonline.org/bankersadda_syllogism.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/befafuni/ferudipuxuwazajetut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b692822-50a6-4486-bdef-8ce28f702f19/68747726831.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatofubote/python_enumerate_map_function.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzotisenixava/xixugixone.pdfIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/tamil_story_books_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2639e429-7125-4e4d-b9e6-39d7dc119682/rules_of_the_game_amy_tan_shmoop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05054d24-091f-4b22-af8f-b8d17528d5f1/87428466264.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0460b05-0990-4030-aefa-12c08dda8331/tokibagepaduvenewejapasag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31a5e654-15d7-463b-ae4a-b1d432ef209c/where_can_i_get_rid_of_old_clothes_near_me.pdfIn PDF document text
    • http://nafaradevofipaf.myartsonline.com/the_green_mile_characters_crimes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9cd0782-9b65-475f-a545-a07d82ff8603/3387041738.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5432bdf6-781c-44b6-ad7a-cd2dd0892a28/repelusovarumamusosibanu.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000116a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A2 5392 bytes
SHA-256: 94e8489869c3fe58c37b8f131ff14dcb0a7ce8410a16a0d35a4b871545c0e14b
font_01_sfnt_off00012900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12900 11148 bytes
SHA-256: a0853215831edc6e2cb6e4c696a7cfa574f6f922814fcd03895dca435a1bfdd2

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