Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea87c88da2565827…

MALICIOUS

PDF

72.2 KB Created: 2021-02-19 08:06:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 275c98829f6dac3ea298dc3a782d47c4 SHA-1: 2797f13a74a868b18e4c7f4a7356dc222d3b5c45 SHA-256: ea87c88da2565827d7ef04fa6e376276a15fb60d120a4c236d7e375fef46cb28
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The PDF contains numerous embedded URLs, with at least one pointing to a suspicious domain ('jacksth.ru') that is likely part of a link farm designed to redirect users. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest an attempt to obscure the final malicious destination or distribute various malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/strik?utm_term=dyson+dc41+vacuum+replacement+parts PDF link annotation
    • https://jinezivatu.weebly.com/uploads/1/3/4/6/134687025/wumekamojujo_sipiwibopitowit_vizuvimaxegiboz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481820/normal_5fdebf979d7c2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368503/normal_5fcf21873d1f0.pdfIn PDF document text
    • https://zajodufukotu.weebly.com/uploads/1/3/1/8/131857357/5580981.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443356/normal_5feb5f6cde391.pdfIn PDF document text
    • http://arenaprobet.com/vegamigojesozumigu9ya3a.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://nebokidib.epizy.com/ethiopian_movie_free.pdfIn PDF document text
    • http://zekinap.epizy.com/ap_environmental_science_2008_free_response_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/ziwuvijevo/12393921935.pdfIn PDF document text
    • http://sotuwekelog.epizy.com/guided_meditation_healing_honest_guys.pdfIn PDF document text
    • http://sodunaxa.epizy.com/govusadudemekadigebike.pdfIn PDF document text
    • https://s3.amazonaws.com/tarajix/bts_love_yourself_answer_full_album_list.pdfIn PDF document text
    • https://s3.amazonaws.com/jeromisixinolib/english_practice_test_with_answers.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_off0000cfa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA7 5356 bytes
SHA-256: 3c43415b5165e4ebcc4af800fe5c1be9b5375fb56a46d31edd8f738d9f698c2d
font_01_sfnt_off0000e1d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D7 10624 bytes
SHA-256: 8b33458c3bc399abd5dc736c0dbe000919f62a12c92f28b066fa5c5bb2d87dc9
font_02_sfnt_off00010606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10606 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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