Malicious PDF — malware analysis report

Static analysis result for SHA-256 918ac91e436787bf…

MALICIOUS

PDF

84.6 KB Created: 2021-03-22 01:20:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 58e3ad12d44e9f203b0fbf4a9f486e2b SHA-1: 9e7d8d0dea64ef7587265117a4925c010ddf718a SHA-256: 918ac91e436787bfca1ccb481c8efa64e9572635ed4d54c755090d255e9c4465
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://crophysi.ru/award?keyword=aiou+solved+assignment+code+1423+spring+2020+pdf PDF link annotation
    • http://lunatan.medianewsonline.com/jiturutedenoma.pdfIn PDF document text
    • http://reduslimitalia.website/52156601696z7y1d.pdfIn PDF document text
    • https://kalepadakib.weebly.com/uploads/1/3/1/6/131637037/747325.pdfIn PDF document text
    • https://menuwenuxunok.weebly.com/uploads/1/3/4/6/134682317/4194575.pdfIn PDF document text
    • http://insuranceautousa.com/nice_guidelines_copd_prophylactic_antibiotics6egr0.pdfIn PDF document text
    • https://kilejotiwig.weebly.com/uploads/1/3/1/4/131406519/rinoru-nijakomog-zazomawevuw.pdfIn PDF document text
    • https://nozodipipagim.weebly.com/uploads/1/3/1/4/131438171/439d4c5e.pdfIn PDF document text
    • http://liberum.sportsontheweb.net/daxobiteverufixoluvav.pdfIn PDF document text
    • http://hidver.com/80371685045iesmj.pdfIn PDF document text
    • http://fafikup.scienceontheweb.net/debaj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ac32aae-d8c3-496c-b5e1-b07236f14e0a/is_twilight_6_really_coming_out.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ed46b60-59c2-45cf-9aa2-3574c21fd24d/9590446182.pdfIn PDF document text
    • https://s3.amazonaws.com/vokeri/6283823686.pdfIn PDF document text
    • https://348ddb29-83e1-4812-94a1-743b72ef9b42.filesusr.com/ugd/23b571_c3b44bec577544ff8dc6ab50e9e6832d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/megulu/vupevutov.pdfIn PDF document text
    • https://e33362eb-94ba-4427-a888-6f4863169a18.filesusr.com/ugd/36ce96_ff0d6099755747daaa2ae39855c19322.pdf?index=trueIn 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_off00010948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10948 6104 bytes
SHA-256: 5a03515346ed9399a3f80e08f22b1bc673fd03b7ec97fb8f9e8c21bc690fc707
font_01_sfnt_off00011e0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0D 11600 bytes
SHA-256: 5afb27a4a606d56cda2865f97d5cb1e13724086a26ed4e1356cf465bd643c9e8

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