Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a53ca826241db47…

MALICIOUS

PDF

87.1 KB Created: 2021-04-04 20:20:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: aa973278b038e013ef523075a499d7e4 SHA-1: 6c604f2cb6a67e48031c12eb1ce84d850db73be2 SHA-256: 5a53ca826241db47b721e516d8655af815b3fd65959b8b9a2fa941dbf1ad8193
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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://jacksth.ru/wix?keyword=on+cooking+study+guide+answers+quizlet PDF link annotation
    • http://wudaxozibutix.sportsontheweb.net/68763902010.pdfIn PDF document text
    • https://cdn.sqhk.co/kurotevu/Q5Egcge/occupational_health_and_safety_specialist.pdfIn PDF document text
    • https://norobeso.weebly.com/uploads/1/3/4/5/134586389/waxisasukugojepin.pdfIn PDF document text
    • https://cdn.sqhk.co/webunojixisa/xwZiaA6/80708713503.pdfIn PDF document text
    • https://cdn.sqhk.co/lexoxuxoluvi/jNF8xVg/40772345461.pdfIn PDF document text
    • http://wovuwukotuvoxi.mygamesonline.org/xutodudalasizesavuvojal.pdfIn PDF document text
    • https://cdn.sqhk.co/gixedomawa/hjlf8jc/xegevuragipasedewugizu.pdfIn PDF document text
    • http://tijudiwulewanuw.getenjoyment.net/98726351432.pdfIn PDF document text
    • https://demijejave.weebly.com/uploads/1/3/4/6/134607426/degotupefulopoki.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mijumomub/batomevezatimubu.pdfIn PDF document text
    • https://s3.amazonaws.com/savukojubusum/memotikafowe.pdfIn PDF document text
    • https://d38713d8-f9e0-49bf-8e72-3f46774ce551.filesusr.com/ugd/b3faf5_1202d5c47a634917b7a0e68a6e7c00c0.pdf?index=trueIn PDF document text
    • http://ralirajuz.atwebpages.com/barcode_generator_format.pdfIn PDF document text
    • https://75ca6b5e-a470-4e0e-8004-b00a9f1721b4.filesusr.com/ugd/1e4819_5be492d202f94366b365dd0bf6ec6ab5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zoluwivebiro/brand_equity_research.pdfIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/best_exercises_that_dont_need_equipment.pdfIn PDF document text
    • https://s3.amazonaws.com/jasipefulaxiduj/one_thing_remains_jesus_culture_lyrics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d17a1d86-fb8b-4f56-8d60-48d48716bac8/double_cross_rpg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9400c66-ae29-43b5-a6f5-81dd5f3b0a72/15023989062.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2926987-87ce-45a6-be63-8b6a4c78cd7e/27087223555.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000110ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110EF 5568 bytes
SHA-256: cc4db8a133491b2901b56ec9b099567577e49ec0ab61d0c655d83b6fbcb0b838
font_01_sfnt_off0001240c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1240C 12608 bytes
SHA-256: fe0930d4f613e92c79d8ac3a8541dfee264c51952c7b7e5e6b2794fffea4fc81

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