Malicious PDF — malware analysis report

Static analysis result for SHA-256 c034ec5c70c5e857…

MALICIOUS

PDF

107.7 KB Created: 2021-02-20 05:11:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 46e7e5dcfa90a46e7d2fa43e0d34a725 SHA-1: fb529e4c28f820200fed17c3bbf40c8d5b728dae SHA-256: c034ec5c70c5e857f8d00a3aec170af13ec74fe2969d6ee0b6dd447497ad70bd
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm and employs a social engineering lure to trick users into installing a browser extension or update. While no scripts were directly extracted, the presence of external URLs suggests it may attempt to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://jacksth.ru/aws?utm_term=stairway+to+heaven+chords+solo PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4465548/normal_5fc5b0ea16da1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479446/normal_5fcad6da1a58c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393193/normal_600b1deab8a6b.pdfIn PDF document text
    • https://nimivisedasefu.weebly.com/uploads/1/3/1/0/131070972/4039103.pdfIn PDF document text
    • https://gareketekefebon.weebly.com/uploads/1/3/4/6/134695024/piginadisegotejakaxo.pdfIn PDF document text
    • https://bomexufimewaw.weebly.com/uploads/1/3/4/5/134517434/14045d76fb6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412902/normal_5fe8ff0c82208.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mafixatoje.epizy.com/churidar_neck_designs_free.pdfIn PDF document text
    • http://pawolukexuw.epizy.com/going_home_bagpipes_sheet_music.pdfIn PDF document text
    • http://kadebenatoloxib.rf.gd/grama_sachivalayam_exam_key_sheet_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/bomupi/12371840870.pdfIn PDF document text
    • http://kezatafoxab.epizy.com/52305551137.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
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10958 5120 bytes
SHA-256: b50ecb6e1108aa7219c6c4bcd613988ca72583943e56a04b0753339c661353ca
font_01_sfnt_off00011ae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE7 5384 bytes
SHA-256: bc5c50216c938112aa41bb9c03d07c682108e1a48367d91ace2b1c21319d3a64
font_02_sfnt_off00012d0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D0A 6316 bytes
SHA-256: 9b3aa4589ea32c764a6abf3235db41878f392002f4403bbf411590d17fabfa59
font_03_sfnt_off00013c6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C6E 18128 bytes
SHA-256: f0da0dfa1c04ef2b30c3630eddc0b6c792816ac939051ad1fa3c2a57864f15c4
font_04_sfnt_off0001773a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1773A 17552 bytes
SHA-256: 6f2b9800b6368d0ed95dacef510ff736c24f396c2e0f6e401ff3d5c7141093b9
font_05_sfnt_off00019131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19131 6052 bytes
SHA-256: d1cd393eb964f54511eec60f115e7e4c0e4c88b4b7eb7f85cec669c5ce3251d4

Open this report in the interactive analyzer, or submit your own file for analysis.