Malicious PDF — malware analysis report

Static analysis result for SHA-256 458bd47e5f433244…

MALICIOUS

PDF

66.7 KB Created: 2020-11-29 21:03:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 1aa639d536a63c79fa29ec7bd85af282 SHA-1: d7a8c22edff6f7db9d124cceb3f7d8aa1d960af1 SHA-256: 458bd47e5f433244677534bfca0843f5a9c0758be72833f72bbc200db99ec7a5
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://trafftec.ru/123?utm_term=online+math+tools+for+students PDF link annotation
    • https://malinozibide.weebly.com/uploads/1/3/4/3/134380659/653939555c5bf.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/zanadutut_wexudafenatogun_jetomefoja.pdfIn PDF document text
    • https://bidoruwo.weebly.com/uploads/1/3/4/6/134651737/jujusutowe.pdfIn PDF document text
    • https://bugupoxe.weebly.com/uploads/1/3/4/8/134850066/4600758.pdfIn PDF document text
    • https://gugabezari.weebly.com/uploads/1/3/4/5/134577353/nebalerigiziji.pdfIn PDF document text
    • https://piziruzebizopu.weebly.com/uploads/1/3/4/3/134350425/9a9d26ff3b.pdfIn PDF document text
    • https://belafawejogawol.weebly.com/uploads/1/3/4/5/134583754/jakadaworulozazur.pdfIn PDF document text
    • https://nidiladidubupa.weebly.com/uploads/1/3/4/7/134753920/df9230a07ec5.pdfIn PDF document text
    • https://kafedujewerom.weebly.com/uploads/1/3/4/6/134622586/8802884.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffbc0b58-4106-4d4c-a892-1237af6b58be/regard_regards_usage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23e600c7-9036-46a7-9ee7-16a865938336/nazabexutadaxowilarojamev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15e402e1-0f53-42fb-91ac-3251d2b294bb/gaxebapovinizelaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6c43855-7d81-4b63-b545-e82012b700c6/xuwazezijokazom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb1c34d5-be1e-4439-9929-25bb5e81a249/felamupexin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad620d25-9265-4988-b286-b6e7bb6e07f2/88577450573.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_off0000cbce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBCE 5176 bytes
SHA-256: e60f7d77e66ed5b795f59fc70b39f199ba157f2d625e77e74212774491dfa4a9
font_01_sfnt_off0000dd33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD33 9536 bytes
SHA-256: 2b8854339a26ef1ea04e7447cca94bb14df0d4393f1d9e7a62d3af354b938661

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