Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fd14ea1637a4593…

MALICIOUS

PDF

75.0 KB Created: 2021-03-24 13:23:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: b6b6bbbba0bdb0c0eff15ef200c6036c SHA-1: b84fdff2095a8eb9768cdc7a15934be765c89f69 SHA-256: 1fd14ea1637a4593f2b43677ae9b093d1b6846a18d683b655c47b3cc68b9fbd9
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL pointing to a site that appears to be part of a link farm for SEO manipulation. ClamAV detected the file as 'Pdf.Phishing.Trojan', and a machine learning classifier also flagged it as malicious. The document body, though heavily obfuscated, suggests a lure related to 'corporate finance exam questions and answers'. The presence of external links and the malware detection strongly indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://druttle.ru/wix?keyword=corporate+finance+exam+questions+and+answers PDF link annotation
    • https://cdn.sqhk.co/zumumolebajo/gfgioki/katerizikojejovovaj.pdfIn PDF document text
    • https://metasabuvaro.weebly.com/uploads/1/3/2/6/132681671/a86aa387e821.pdfIn PDF document text
    • https://mewimazekik.weebly.com/uploads/1/3/4/0/134099221/direkixatesanutij.pdfIn PDF document text
    • https://cdn.sqhk.co/bexefoboxevi/ijgciaD/1864312571.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/20cd58f6-5451-4e32-9fe0-42add2cc81f4/20083418321.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cbb25ed-548b-44ab-ae8f-edc56234c32f/syma_x5c_camera_wifi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/117d633a-c306-43a0-b231-dfcaaa231ea8/19659374035.pdfIn PDF document text
    • https://584abdf6-e408-48d3-a53c-4313a8f82471.filesusr.com/ugd/18ee90_c91391562ed64683933d1267d204a415.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jiwisi/santa_clara_unified_school_district_payroll_department.pdfIn PDF document text
    • https://s3.amazonaws.com/xenavuxa/carrom_board_game_karne_wala.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7533100c-b339-4fb2-bce9-d96215c0cfe4/47593366757.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54a93b90-20b8-47f1-bc0d-33da3be25a97/after_we_collided_novel_series.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0474ad47-8966-4b5f-acf2-3bb353c4f460/who_wrote_the_quran_islamqa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9c50d37-92a5-41d9-b28f-a7bcc30ea5b1/xesabomilevonid.pdfIn PDF document text
    • https://8a833fea-7c9a-4d2e-a5a7-d3590f42a3e5.filesusr.com/ugd/9aab09_b5d0161ec0f6492fac474088993dbc15.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sosupejuxofedo/25516511137.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/bosch_dishwasher_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/sagotomagin/army_mission_games_for_pc.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_off0000e68f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68F 5460 bytes
SHA-256: aef782e332fdba3a89343e48cffd70afa38cf24fd351299bf3417d4ef28381db
font_01_sfnt_off0000f919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF919 11072 bytes
SHA-256: ce76577204eed15862edd1ca3ed74368c99f59ff338a63fcf98aaa6ec89be4b0

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