Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce5ba986054a37cb…

MALICIOUS

PDF

69.8 KB Created: 2020-12-01 08:22:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 79d03b5bb3d6582b9aec61d11d582275 SHA-1: 7d102b90a7b7c69a4278660882c3825eccdaeeda SHA-256: ce5ba986054a37cbd07812965288073e823179512d1ead9a16d0d34bd6f68d22
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs, many of which point to disposable hosting or known malicious redirectors. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to malicious sites for further exploitation or phishing. The document body is heavily obfuscated and contains garbage data, suggesting it is not intended for human consumption but rather as a container for malicious links.

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
  • 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.
  • 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://cctraff.ru/strik?utm_term=what+does+int+mean+lol In PDF document text
    • https://loraxero.weebly.com/uploads/1/3/4/3/134332649/jonoz.pdfIn PDF document text
    • https://vonorakukipi.weebly.com/uploads/1/3/4/7/134721252/89f30137ede304.pdfIn PDF document text
    • https://kugixixubeleji.weebly.com/uploads/1/3/4/3/134324677/puxoxededitixerader.pdfIn PDF document text
    • https://faxuledobiwud.weebly.com/uploads/1/3/4/3/134311760/322555.pdfIn PDF document text
    • https://jupoviladuxeru.weebly.com/uploads/1/3/4/3/134310568/7490823.pdfIn PDF document text
    • https://naxedomabaxa.weebly.com/uploads/1/3/1/6/131606472/nadolekiv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418175/normal_5fab198a64a82.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://static1.squarespace.com/static/5fc06b0d2e537a05ef0695ba/t/5fc168b13485235c86fbd255/1606510771548/kaditozak.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0f06b104edf1d7780fa74/t/5fc4d5413f75b166436c0ce9/1606735179780/solving_higher_degree_polynomial_equations_worksheet_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/349d0c1b-5acb-4dd9-9bf7-4045d90730fb/fujoju.pdfIn PDF document text
    • https://s3.amazonaws.com/sikuva/angular_7_tutorial.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C4 4772 bytes
SHA-256: c39a84b91033a1539a31fee293633ea221c6a2c7b9f4cb055663484099cfc221
font_01_sfnt_off0000d8d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D0 10440 bytes
SHA-256: 4a8ccc47f13216361b0d657d7b5d70919011495b025255c5df6437e61ae9b617
font_02_sfnt_off0000fc41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC41 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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