Malicious PDF — malware analysis report

Static analysis result for SHA-256 f52728e95910dcdb…

MALICIOUS

PDF

88.2 KB Created: 2020-11-20 06:43:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 41eb93d59ce83548646c51dcad8a611b SHA-1: bf115c2853426b1cb56489302c8b9069555c961c SHA-256: f52728e95910dcdbc3975a854c3ecaf98c716e01229403600a3145253632d28c
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF file identified as malicious by multiple heuristics, including a critical finding for a malicious redirector link and a PDF link farm. The embedded URLs suggest an attempt to lure users to external sites. The ML classifier and ClamAV detection further support its malicious nature. The primary attack pattern involves redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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/123?utm_term=proportional+to+symbol+mac In PDF document text
    • https://cdn-cms.f-static.net/uploads/4377379/normal_5f8a7b174bfe4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387920/normal_5f9ff96bb201d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368972/normal_5f899985d1f19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368466/normal_5f91e27e28f7a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387938/normal_5f981b7c48cdd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406223/normal_5fa9e868c76a5.pdfIn PDF document text
    • https://gadevonetikob.weebly.com/uploads/1/3/4/3/134358307/fikuzote.pdfIn PDF document text
    • https://jolefopasovoja.weebly.com/uploads/1/3/4/4/134402584/04c6286af0aca.pdfIn PDF document text
    • https://wexegupewafux.weebly.com/uploads/1/3/4/4/134443826/pomazudidifi.pdfIn PDF document text
    • https://riwisasivituw.weebly.com/uploads/1/3/1/0/131070703/lakorixa.pdfIn PDF document text
    • https://wanexopoxada.weebly.com/uploads/1/3/4/7/134704754/9784d630cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458631/normal_5fa2079a4061d.pdfIn PDF document text
    • http://www.typoland.com/http://www.typoland.com/designers/Lukasz_Dziedzic/CopyrightIn PDF document text
    • http://www.typoland.com/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zurovajij/28029340367.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a742f5f1-5010-44e8-a003-cd09ca397924/god_of_war_ghost_of_sparta_ppsspp_cheats.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7c099e2-92f8-44c8-8905-4ecd940dae6d/half_hanged_mary_questions_and_answers_7pm.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B5 6588 bytes
SHA-256: b3260a8b27c40a1c9408c40b3dcfb9ec9ded560232013cbc1ca8de37ebb5a831
font_01_sfnt_off0000d9f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F7 6168 bytes
SHA-256: d841e6ee9fc5f8d88f1d94419f2a0f587508a927e8deb92e2b18ca34c352e48a
font_02_sfnt_off0000e996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE996 5320 bytes
SHA-256: d3d0fa95363e5207fe82d2bed79acc3adf8380bcefb2c80654a65456e1ac3a24
font_03_sfnt_off0000fb97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB97 14696 bytes
SHA-256: 165d95792df191246f63779a97c380fa37d17aa8ed3e8cb8f1f02dc2ea3a3f94
font_04_sfnt_off00012c61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C61 21996 bytes
SHA-256: 0d8f501958bff09785e977c7fec409e6a24ea2722a5a1716d09f5a52f5e49d8c

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