Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc5957661f759fe2…

MALICIOUS

PDF

75.1 KB Created: 2021-02-22 02:08:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 50797a01e6f5ea86e5171013f481ef04 SHA-1: 933a3cfa1377532a7f81978686b8fa416a924656 SHA-256: dc5957661f759fe2fe8c94ce31539695de948ee6394f6f680be3791849aacb1b
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://baarspo.ru/strik?utm_term=which+exercises+to+do+after+chest+day PDF link annotation
    • https://tuxotise.weebly.com/uploads/1/3/1/3/131379496/zopamobalotiluvam.pdfIn PDF document text
    • https://vuderuxedus.weebly.com/uploads/1/3/4/6/134692959/kipatolawefolowupe.pdfIn PDF document text
    • https://vunixumo.weebly.com/uploads/1/3/1/4/131453253/5046185.pdfIn PDF document text
    • https://telozigigozato.weebly.com/uploads/1/3/4/3/134310186/logasuwixederuga.pdfIn PDF document text
    • https://rejoxaratexudo.weebly.com/uploads/1/3/1/4/131453252/4289393.pdfIn PDF document text
    • http://kumorepo.22web.org/26950279616.pdfIn PDF document text
    • http://segowesilo.iblogger.org/76558689727.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://pigibotokaper.epizy.com/7613249870.pdfIn PDF document text
    • http://metivatozu.epizy.com/68264328578.pdfIn PDF document text
    • http://dixolasafu.epizy.com/dasarawusapeziluwedinu.pdfIn PDF document text
    • http://vusukunuvedigup.epizy.com/fimaz.pdfIn PDF document text
    • http://zotebizitiwiwe.epizy.com/what_are_your_strengths_interview_example_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/kefodek/figures_of_speech_worksheets_grade_11.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisigetizoxif/english_story_books_online.pdfIn PDF document text
    • http://rekekolulopar.rf.gd/44800988227.pdfIn PDF document text
    • https://s3.amazonaws.com/vogubivajavofu/77943818894.pdfIn PDF document text
    • http://zuzinaxawalodi.epizy.com/florida_insurance_affidavit_form_83330.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEC 4944 bytes
SHA-256: e968d0672a23635aca53820fb750a59a50babbd44b9cb6e100f0058a0594e870
font_01_sfnt_off0000ede5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE5 10288 bytes
SHA-256: 5f3118b590090e24a0853f5545e33e44901deba0d1fd292d4de01582a998cf17
font_02_sfnt_off00011110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11110 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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