Malicious PDF — malware analysis report

Static analysis result for SHA-256 29ecaaeb2686fe25…

MALICIOUS

PDF

171.9 KB Created: 2020-11-22 18:53:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 908b37938140536a6c6845b225683bdf SHA-1: d753f8264101ac1d73391b714383c8c6907a26b0 SHA-256: 29ecaaeb2686fe25b8f95fec10ea42ba9b5d14ec585c36f6affe553d83b63e3f
224 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. It uses a password-protected-archive lure. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://gettraff.ru/123?utm_term=el+incre%25C3%25ADble+mundo+de+gumball+temporada+6 In PDF document text
    • https://lijonalorobu.weebly.com/uploads/1/3/4/3/134340538/tonereb_fedelazepixeg.pdfIn PDF document text
    • https://nonudefetug.weebly.com/uploads/1/3/4/3/134314303/liwutuxiv_silodizad_joluwenupob.pdfIn PDF document text
    • https://zoropafe.weebly.com/uploads/1/3/4/3/134374448/zatagifefulo.pdfIn PDF document text
    • https://jedapozopimu.weebly.com/uploads/1/3/4/6/134614290/79a0fade28799.pdfIn PDF document text
    • https://tifunubuxeji.weebly.com/uploads/1/3/4/5/134523212/2397ac2f0.pdfIn PDF document text
    • https://zapirawega.weebly.com/uploads/1/3/0/9/130969804/f6b5c62.pdfIn PDF document text
    • https://nikokabiliru.weebly.com/uploads/1/3/1/4/131409463/letemuzipefonug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425916/normal_5fa075eb0b1ea.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://s3.amazonaws.com/purixifusipelid/browns_funeral_home_martinsburg_wv_obituaries.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2a308a4-e522-4d7d-b8c5-8b15444ea6a2/piralatejoferepime.pdfIn PDF document text
    • https://s3.amazonaws.com/rogugagatuf/4658645219.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7182cdf-fb81-4794-bfad-18ca291764ed/gabung_file_jadi_satu_halaman.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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00023e12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23E12 5404 bytes
SHA-256: 2c78d1c9e0519bc63c71189821988b4a2cb89b8f3d068a0787740f18eacaa3a7
font_01_sfnt_off00025049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25049 13260 bytes
SHA-256: 153cdcf78f3ee63c00f79590790b79761db99290bb03ce8901780e4b45da7b93
font_02_sfnt_off00027b49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27B49 16332 bytes
SHA-256: 755c42bc543e29558a8d0bcfea944469b9784b935a0ee9f7988587a17557f968
font_03_sfnt_off000290cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x290CC 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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