Malicious PDF — malware analysis report

Static analysis result for SHA-256 e10f0b8984517ad5…

MALICIOUS

PDF

71.7 KB Created: 2021-05-16 18:04:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: d7b80adb12000f41fd786b3f49b68e3d SHA-1: 3d2a2f42828b56406ce99e1df8605e1646186760 SHA-256: e10f0b8984517ad58ccae906bc6db10b4cd6a346b51699f81e67ed5c3b3fe8e6
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to disposable domains, suggesting a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF is designed to host many links on potentially untrusted hosting. No scripts were extracted, but the presence of numerous external URIs suggests the PDF's primary function is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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 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://midufefew.ru/strik?utm_term=what+is+on+the+sidewalk+bleeding+about PDF link annotation
    • https://cdn.sqhk.co/gadujotev/ihhgikm/ravogi.pdfIn PDF document text
    • http://fishland.store/fix_kitchenaid_stand_mixer_motorq69cm.pdfIn PDF document text
    • https://cdn.sqhk.co/rerunaropiz/rVhaKie/monster_energy_nascar_car_driver.pdfIn PDF document text
    • https://cdn.sqhk.co/letopoto/ghb2rhb/52315977578.pdfIn PDF document text
    • http://hackins.site/95167739724oa0th.pdfIn PDF document text
    • http://sutovuresas.mygamesonline.org/64198567643.pdfIn PDF document text
    • http://trixy-matrix.space/3302283829tpmhj.pdfIn PDF document text
    • http://matras-24.ru/74597360085t2lpf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486969/normal_601a77725da4b.pdfIn PDF document text
    • https://cdn.sqhk.co/ranetixeba/jegyyhf/coding_languages_for_data_science.pdfIn PDF document text
    • http://mewudaguzexo.sportsontheweb.net/66278939308.pdfIn PDF document text
    • http://sy0n.icu/dantes_paradiso_levelskdspd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369525/normal_5fff6372ea564.pdfIn PDF document text
    • http://idealica-official-it.website/196695025900mige.pdfIn PDF document text
    • http://gepexoliv.medianewsonline.com/basic_electrical_engineering_course_online.pdfIn PDF document text
    • http://gepanukotex.getenjoyment.net/how_much_model_3_cost.pdfIn PDF document text
    • http://zabovawupe.mypressonline.com/popular_childrens_fairy_tales_list.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423696/normal_60127fab51107.pdfIn PDF document text
    • http://samelike.site/11336195157za1f9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497650/normal_5ff049dbb6e9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484610/normal_603c2c5f3baf3.pdfIn PDF document text
    • http://criticcxck.space/pimaloka0i78p.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ad843f61-c544-48d7-8cfb-3c048b9edb46.filesusr.com/ugd/0dd9ed_28a433132b0c46b986bba6f21c246758.pdf?index=trueIn PDF document text
    • https://54a0e2cb-796f-4f80-9aaf-d11633176b06.filesusr.com/ugd/b0c554_90245b2ba8a4458ba2cb33d7fd893431.pdf?index=trueIn PDF document text
    • https://917ed8d3-8a9f-4c5c-a3ad-554e533308ad.filesusr.com/ugd/a4e402_518178c0f7834d20b1204eb3ab0ea7ff.pdf?index=trueIn PDF document text
    • https://354df738-7a8c-4643-bdcd-aa58f7c4bd0c.filesusr.com/ugd/69cf62_c27172daa2ec40bfa826ca34f0bac1be.pdf?index=trueIn PDF document text
    • https://6fd4412c-3e6e-4f21-a9af-8137ffc6c0d9.filesusr.com/ugd/03469c_34ed5a54a39a4ec18a47d3e6bfdc4842.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_off0000da64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA64 5300 bytes
SHA-256: 4bc6b69e33ec8a3ae78adc432595f5521c3b993efd603f0a43c307237c5fcf71
font_01_sfnt_off0000ec7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7F 10640 bytes
SHA-256: cbbc68cb1ad400a316aa840852de17652443e6ae29c8a9d62a70b4464ecb8cc6