Malicious PDF — malware analysis report

Static analysis result for SHA-256 e558d1f6160037a3…

MALICIOUS

PDF

77.6 KB Created: 2021-03-15 13:43:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 39edf026b95896158d98e6274507003d SHA-1: 26ce61747fc2e0d8b9441c3a6c4981ff1b02beac SHA-256: e558d1f6160037a370e9bcce0d91fd85e459f67cf9701adeebc8b4839cb47d6d
74 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs and a heuristic firing for PDF_SEO_DISPOSABLE_LINK_FARM indicates it's part of a link farm, likely for SEO poisoning. The presence of a 'Download Now' lure suggests a phishing or social engineering attempt to trick the user into downloading further malicious content. While no scripts were explicitly extracted, the ML classifier strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://pelibifir.ru/award?keyword=marketing+analyst+job+description+pdf PDF link annotation
    • http://zunidesejive.22web.org/mole_concept_and_stoichiometry_class_10_icse_numericals.pdfIn PDF document text
    • https://xudomulur.weebly.com/uploads/1/3/4/0/134040538/makaxedel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464311/normal_5feaf32e140e2.pdfIn PDF document text
    • http://rirenanevigi.22web.org/bootstrap_4_login_page_template_free.pdfIn PDF document text
    • http://tonozezoziw.iblogger.org/wexufupobevusisuzomix.pdfIn PDF document text
    • https://cdn.sqhk.co/lanuniwa/gSgcwia/29227120653.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443594/normal_602b83f83c696.pdfIn PDF document text
    • https://cdn.sqhk.co/surofowudula/2hbgd0Z/gudesuzaruv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365594/normal_5fe43a5715b13.pdfIn PDF document text
    • https://cdn.sqhk.co/xekemini/oM9mCgg/nebinegibozel.pdfIn PDF document text
    • https://junobinedutuki.weebly.com/uploads/1/3/2/7/132712306/meful-zelizabaf-pesumamam.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465264/normal_5ff3b985ba45e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pavefobigemaxe.rf.gd/rebezikofi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46e34605-62d1-48c4-bf09-443155d415ed/puzivigudorepotuzedodu.pdfIn PDF document text
    • http://pemuwosefewe.epizy.com/calculus_book_for_bsc.pdfIn PDF document text
    • http://pusupap.rf.gd/87460181210.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/633ebf1a-aa63-4b37-bc60-b1f116cb8b3a/kuwujapopiku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ff8deb6-08d7-4571-95df-fb2340336f0e/60482385960.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_off0000f0af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AF 5708 bytes
SHA-256: 457be1fc8e0e2ca2f8419dca6f5cf3e40ca1de9724f6046be3ab36f2880fd3d8
font_01_sfnt_off0001044a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044A 10952 bytes
SHA-256: 48e4b8e21fff1592e2d14a05fc1a7eedd4d4d06a7e1dac915bb719d53edc8959

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