Malicious PDF — malware analysis report

Static analysis result for SHA-256 54d28026d25be25c…

MALICIOUS

PDF

82.5 KB Created: 2020-11-18 12:36:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: e837213087a3d9478f0999d0d75d2fdf SHA-1: 51624cc73480f7a0b1169bed742d0ef973506107 SHA-256: 54d28026d25be25ccf644e37f107c76c881976b6207447df71a43c1a44731ad6
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, contains text related to 'ocarina of time theme piano sheet music', suggesting a lure to entice users to click the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/aws?utm_term=ocarina+of+time+theme+piano+sheet+music In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368266/normal_5f8c989921da0.pdfIn PDF document text
    • https://kesevaze.weebly.com/uploads/1/3/1/3/131383297/fd5b6.pdfIn PDF document text
    • https://farupixin.weebly.com/uploads/1/3/4/3/134314126/lamaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366007/normal_5f872a97c6672.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380403/normal_5f9718df91d97.pdfIn PDF document text
    • https://walijogopabo.weebly.com/uploads/1/3/0/7/130776167/segifelesilokunuva.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366044/normal_5f87285242d73.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384028/normal_5f8e31cf761a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427282/normal_5fb00c1b22b2b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368487/normal_5fa250d16d03d.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/7c07eb22-0bed-4800-b0b5-7f6a51969efb/.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c1076a2-b06b-45ac-b2de-0ebea6ed0f96/ezra_brooks_decanter_price_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38a49c01-4f5e-457c-bbca-cbba36bc3ff4/vavilatajiwopuxeta.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 4

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_off0000e936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE936 5252 bytes
SHA-256: 2322aca5f6d461ab9e14441069aa290b50de247568f13ae20d70017a9fe4b12f
font_01_sfnt_off0000faea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEA 10780 bytes
SHA-256: 9bcbd278f3367dab66a95152ec86ab8fbe8c68ec5e1b01bf16e7c2dc4194b9cc
font_02_sfnt_off00011fc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC5 18572 bytes
SHA-256: 0f4392e21cef77c67d6dc04f7067e3efc44ce2468fc4b47fa1332eb9a9e6748e

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