Malicious PDF — malware analysis report

Static analysis result for SHA-256 523fb607f6af4137…

MALICIOUS

PDF

83.9 KB Created: 2021-04-02 12:43:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b0fc178ad79f2a37b03f6aab613030a8 SHA-1: 0efc299d5c11f169d4dcfc384af620e7ddb85243 SHA-256: 523fb607f6af4137429e473b808e68a4b35924ab299226b0d6ca16dfddb48a63
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 0.9997

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://druttle.ru/wix?keyword=strangers+to+these+shores+11th+edition+pdf PDF link annotation
    • https://cdn.sqhk.co/womafafowix/LbJghjf/126321265.pdfIn PDF document text
    • https://semebikifotiz.weebly.com/uploads/1/3/4/7/134752265/8557106.pdfIn PDF document text
    • https://cdn.sqhk.co/zojoguxuban/kKidUih/12031884744.pdfIn PDF document text
    • http://xojuxegalixiluj.66ghz.com/k5_learning_english_worksheets.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453734/normal_603434f16a55c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496170/normal_603ee37f2a47a.pdfIn PDF document text
    • https://cdn.sqhk.co/tuseliwi/9jgijhb/wuwotasedolopi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453105/normal_6014486a5cd00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392869/normal_6051400791205.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376870/normal_605721a8130d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481994/normal_600b2315ebbb6.pdfIn PDF document text
    • https://tapoduxumusuna.weebly.com/uploads/1/3/4/7/134733142/ca46d50f02222.pdfIn PDF document text
    • https://pibiwija.weebly.com/uploads/1/3/4/8/134896476/bc0def6880.pdfIn PDF document text
    • https://sabidodavo.weebly.com/uploads/1/3/1/4/131408103/1e46496a29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420617/normal_60377b15893e7.pdfIn PDF document text
    • http://libumuzu.22web.org/antalyaspor_kaleci_formas.pdfIn PDF document text
    • https://lipegarexepi.weebly.com/uploads/1/3/5/4/135400683/vosoloj.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/paxuvagal/larasidadizojudivaxub.pdfIn PDF document text
    • https://s3.amazonaws.com/venunamazozuzo/kakalu.pdfIn PDF document text
    • https://s3.amazonaws.com/kujapomib/game_bloody_roar_ps1_high_compress.pdfIn PDF document text
    • http://pujukejesoteja.epizy.com/wexejotuvamopetu.pdfIn PDF document text
    • https://s3.amazonaws.com/vasofirida/brouilleur_gps_android.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A59 5424 bytes
SHA-256: 0c377826d6d394b90176dc851b7267901f72e68d83fe5fbda206ff6f0d291528
font_01_sfnt_off00011ccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CCD 10888 bytes
SHA-256: 8ae710ed588eb67acf1a2213a8d9ca76ddd2c0eabc8a2c77ad624758002ce30d

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