Malicious PDF — malware analysis report

Static analysis result for SHA-256 545e8a7f79da1400…

MALICIOUS

PDF

45.4 KB Created: 2020-11-09 11:09:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 82df27e8ac3a3e0e34d01a14f36e0583 SHA-1: 2bd4ed8d201a222a0e99dddaab169e974540ff1c SHA-256: 545e8a7f79da1400c329419cab303e8eec62a86caea830aa223ce065df933134
132 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 an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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
  • 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://traffmen.ru/123?keyword=apex+geometry+semester+2+answer+key In PDF document text
    • https://warobakun.weebly.com/uploads/1/3/4/4/134486798/muwaf-falavezezaza-vozexojogad-rirumek.pdfIn PDF document text
    • https://roxoxurapu.weebly.com/uploads/1/3/4/3/134307884/jizowa_bured_pumipobif_fozarefudoli.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426410/normal_5f9bab8d465e4.pdfIn PDF document text
    • https://wimiberurazem.weebly.com/uploads/1/3/4/3/134351881/tejetubedasudukalul.pdfIn PDF document text
    • https://pudorexejuvaw.weebly.com/uploads/1/3/1/4/131455832/bawokopinok-wesuvojesinipe-dozovogu-bofotojanubi.pdfIn PDF document text
    • https://winomumamo.weebly.com/uploads/1/3/1/0/131070375/bebugazijaba-zoxiz-jivazomifikebaf-zogime.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://uploads.strikinglycdn.com/files/5766e6da-4a33-45a0-8369-c04476f8ecb2/pogunulitikasenikepozepiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a283fe53-714f-4621-82ed-54a2e0e1d41b/zezasajebumoguluk.pdfIn PDF document text
    • https://radojosofu.files.wordpress.com/2020/11/i_am_a_rider_lamborghini_mp3_song_do.pdfIn PDF document text
    • https://givolajokofe.files.wordpress.com/2020/11/japatewajaliwififu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d246d5e8-0959-4250-9666-66cdbafe5ceb/lagilemasan.pdfIn PDF document text
    • https://s3.amazonaws.com/pugomonapoxuxe/cambium_vascular_function.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dea0d08d-ceba-42a4-b980-cce3db22f46c/98101455623.pdfIn PDF document text
    • https://s3.amazonaws.com/tesapibebujep/eagle_scout_service_project_workbook_2019.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6378 5296 bytes
SHA-256: 7326a09880c54a11ea60839901408feb0f64a3bfa6815586772637e60d7bb98f
font_01_sfnt_off00007580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7580 10720 bytes
SHA-256: bfe53d3e83c8ebf1d31bb57746ecb319d89ecb0b646ffd5d84df09a0b285086f
font_02_sfnt_off00009a1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9A1F 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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