Malicious PDF — malware analysis report

Static analysis result for SHA-256 1511fc50899cb0be…

MALICIOUS

PDF

76.9 KB Created: 2021-02-23 00:53:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: f4d1d806659489a3410c2eee38aa87c3 SHA-1: 0d165002ad4d6085dfad4ae721f39c1e98708311 SHA-256: 1511fc50899cb0bed8a302921c0e12a3ab51654f5243008bcc7e6d0307d3b56c
184 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 URLs, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. The document body is heavily obfuscated and appears to be junk data, suggesting the primary purpose is to host malicious links rather than convey information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 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.
  • 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://yafferge.ru/strik?utm_term=free+d%2526d+map+maker+software In PDF document text
    • https://static.s123-cdn-static.com/uploads/4418993/normal_6007c85e202ae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416495/normal_5ff3d1404ccd7.pdfIn PDF document text
    • http://svoytrylend.xyz/gofojegabupeputazixym3s0.pdfIn PDF document text
    • http://carinsusa.com/migoludolewexajamubutotupgos5n.pdfIn PDF document text
    • https://kasadinup.weebly.com/uploads/1/3/4/6/134641165/tagipavixu_kededemodaxad_niresojujid.pdfIn PDF document text
    • https://zuzuxaze.weebly.com/uploads/1/3/4/0/134040629/cb0d9.pdfIn PDF document text
    • https://cdn.sqhk.co/komukopa/YicajdZ/64293962182.pdfIn PDF document text
    • https://muvekova.weebly.com/uploads/1/3/5/3/135394778/moxigigukite-madilevoga.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jejivosijej.rf.gd/navigation_app_free.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 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_off0000d8d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D3 4356 bytes
SHA-256: 789e1815b5806ceadd5bbba9763818c23aecebeb39337245655983d3cb40ce53
font_01_sfnt_off0000e7a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A9 13292 bytes
SHA-256: 1b1564163f4396a17effe543a1b68abb06bbd8aff9838cab731ca73b2095c094
font_02_sfnt_off00011208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11208 16060 bytes
SHA-256: d78d7cc1a68daa951b4fbccbcfb906d5a08ad384f187125596154666a45abe72

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