Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5d0557edbc39d65…

MALICIOUS

PDF

73.2 KB Created: 2021-02-11 05:44:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: cef941a85cd0da40fe972b5ab812960f SHA-1: d7064de1803f61f261204c44f68c2a9d50fe20d2 SHA-256: e5d0557edbc39d655fb53c9bd464b1cb2f6cd11a848d62643b446fad5a407c9c
134 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The presence of a 'download button' heuristic and the overall structure suggest a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF's nature and the embedded URLs strongly indicate it's designed to redirect users to malicious content or downloads.

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/123?utm_term=carl+weber+family+business+series PDF link annotation
    • http://mif-smeh.space/pesigemavirunuzakemevevoyrkl1.pdfIn PDF document text
    • https://nojabepeteguki.weebly.com/uploads/1/3/4/6/134669956/fiwura.pdfIn PDF document text
    • http://tozufokoxogo.22web.org/73440468284.pdfIn PDF document text
    • http://biggymstoe.com/ejercicios_resueltos_de_descuento_real_o_justovsfpu.pdfIn PDF document text
    • http://6gusevshop.space/873051280831iwn2.pdfIn PDF document text
    • http://rasezinetoge.iblogger.org/radicales_libres_que_son.pdfIn PDF document text
    • https://xovesoxak.weebly.com/uploads/1/3/0/8/130813458/a5be3.pdfIn PDF document text
    • http://motivawka.online/autodesk_inventor_tutorialsnuvc5.pdfIn PDF document text
    • http://levantemosaic.com/vanetuwevomonozezimupiinau.pdfIn PDF document text
    • http://proba7.xyz/piano_play_magic_tiles_games_appleqf3a6.pdfIn PDF document text
    • https://cdn.sqhk.co/figotabam/V9ibuib/merepovaw.pdfIn PDF document text
    • http://stassikorskyi.com/xelujifajovupb3boq.pdfIn PDF document text
    • http://xrootunited.com/foxedimositutoaaa2o.pdfIn PDF document text
    • http://jobauthor.online/superlatives_worksheets_primaryctmko.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nixuverojezuluz.epizy.com/22564605921.pdfIn PDF document text
    • https://s3.amazonaws.com/zibenoroduzuw/geometry_shapes_of_covalent_molecules_lab_report.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e13d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13D 5152 bytes
SHA-256: c2760eecf182076f077966f969270a7b14029fb5eb3ae09901d659926e6f3dba
font_01_sfnt_off0000f2c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C6 11268 bytes
SHA-256: e1364a1d315e23a0ece0b38c677e91d0a211a5d1155a26e5a1b2fcae238ea055

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