Malicious PDF — malware analysis report

Static analysis result for SHA-256 5445ac0c01474e28…

MALICIOUS

PDF

85.7 KB Created: 2020-12-28 10:02:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 81bfee1aab03cfb49c23d5066ec76157 SHA-1: 1929862014be01bc1c812e229b15593b2f8e2759 SHA-256: 5445ac0c01474e288e3ee4a20e32805636279379f7632217a40f9b5b1f81a16a
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 0.9994

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://trafffi.ru/strik?utm_term=its+me+meet+new+friends+apk PDF link annotation
    • https://pigikitukapu.weebly.com/uploads/1/3/4/6/134693564/gerodagakik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365653/normal_5f9e25e8dd382.pdfIn PDF document text
    • https://bewapuvin.weebly.com/uploads/1/3/1/4/131453684/b21bb1.pdfIn PDF document text
    • https://kixovomez.weebly.com/uploads/1/3/4/8/134868331/1787147.pdfIn PDF document text
    • https://nizegefubazada.weebly.com/uploads/1/3/4/8/134872151/5683519.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403276/normal_5fbdff821f1f6.pdfIn PDF document text
    • https://tesutubesonazi.weebly.com/uploads/1/3/4/6/134682982/3616993.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374536/normal_5fe9902446baa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446382/normal_5fe546c18d4f0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420454/normal_5fc7405802e99.pdfIn PDF document text
    • https://dubanivexog.weebly.com/uploads/1/3/4/3/134331992/51c3fad22.pdfIn PDF document text
    • https://ruritetij.weebly.com/uploads/1/3/4/7/134704214/bipewi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD660 6440 bytes
SHA-256: 629123bfde0685c5f69bbdd27ec008bde0224d5c30af1dabb990f6ee33ea778e
font_01_sfnt_off0000e623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE623 5680 bytes
SHA-256: e80dce708ffd42545fc408bb40991f03a3f892919fb9cbc9b3b23606b173e41b
font_02_sfnt_off0000f9d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D9 5248 bytes
SHA-256: decb05cbb6eea798e7239a777c0b5bbec37ec4d56f42bac7c66df859454bc649
font_03_sfnt_off00010bb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB2 11232 bytes
SHA-256: 453c2367aefb169b3ebc37b9e705b032aa3eee01961b8b8e9d2185ce91e32baa
font_04_sfnt_off00013239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13239 16244 bytes
SHA-256: de75326c02c9703aa8135675b76905c9070d9ce10020753ad5b488e3c1e32ed8

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