Malicious PDF — malware analysis report

Static analysis result for SHA-256 513509153352f257…

MALICIOUS

PDF

84.9 KB Created: 2021-03-08 09:13:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4e2c0679a80584fa04def6a9defb968b SHA-1: adaa5b277312b4e81166106188a823e71927510d SHA-256: 513509153352f25780bde299666f1a3d933fd2d41b5d1772ad77805bf57bd641
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by multiple heuristics, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, suggesting it functions as a link farm. The primary URL observed is https://xezojetit.ru/wix?keyword=area+of+a+kite+worksheet+pdf, which is likely used to direct traffic for SEO manipulation or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xezojetit.ru/wix?keyword=area+of+a+kite+worksheet+pdf PDF link annotation
    • https://cdn.sqhk.co/tarudifirew/qheKBjj/9_months_2_weeks_in_days.pdfIn PDF document text
    • https://cdn.sqhk.co/lexebogefaj/hdS3aIi/best_lottery_scratcher_tool.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479213/normal_5ff0c8dcb5e88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425772/normal_60148aeb03a9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490720/normal_6015e827144a5.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://tumofif.rf.gd/let_it_be_piano_sheet_music_beginner.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5e70734-a753-49eb-97bf-3cd2543f5427/85747280620.pdfIn PDF document text
    • http://nojimaduxonariz.rf.gd/xekadamujisi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58a0a34e-b160-42ad-a168-a566d183468f/does_family_dollar_offer_health_insurance.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16260038-14f2-45e9-a9ce-59ca6f4d6a37/81239202200.pdfIn PDF document text
    • https://1b65b899-5fad-42bd-af9e-a3fb1d6a4c80.filesusr.com/ugd/a2ebd8_585ed41907d740e1b8696b3022b8e210.pdf?index=trueIn PDF document text
    • https://d2d87fd5-5f4d-49aa-ab3c-2263ce4b5d22.filesusr.com/ugd/9169d2_8c8a76a023a2495aa61bf13c4dea6ca8.pdf?index=trueIn PDF document text
    • https://599b09cd-7b6a-4758-94a3-08a08d316165.filesusr.com/ugd/628a76_fc409e7b14ae4cf8b28d34a640572343.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bb4c868-fdd8-4c32-b84d-b0f2fe3abc41/14474023280.pdfIn PDF document text
    • https://59548cc9-d6a6-4b2e-bd73-2bfb7290c7b5.filesusr.com/ugd/3fd21f_e3583eb8e55643739b18654c75680244.pdf?index=trueIn PDF document text
    • http://donafilozevore.rf.gd/62073803489.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df100d8c-cca9-4a69-a80e-3f9097586ec8/al_quran_mp3_30_juz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2bb6906-f812-4798-9409-d4da45e95679/duximobudemokomuguwites.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/317c86c4-97fe-4017-bb11-426afa8a4522/bifalasibofes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e05488f2-eae5-4f31-9a66-d0eefdf6ab8c/jujawi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5996a75-4123-408b-8596-147c65c98dba/altec_lansing_lifejacket_jolt_light-up_waterproof_bluetooth_speaker.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10363 4924 bytes
SHA-256: 59984c4e70a7c5b311f2f296acc20e057ec98c8ab45cbfe62a5593b65fc03dee
font_01_sfnt_off00011444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11444 10476 bytes
SHA-256: cfb74674713493af50a31868bc039dbd82c898e0e1b48d6402437896b6951a5d
font_02_sfnt_off00013821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13821 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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