Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a27f1032d6f2ead…

MALICIOUS

PDF

74.1 KB Created: 2021-06-06 17:57:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 2b75c253ac15daa0a45832ab99ac1a76 SHA-1: 61a526c6d96a189572a8897c20daa1e1f04c240f SHA-256: 9a27f1032d6f2ead187edd68fafd434c4998dc89f30ef37f2c5261f591e7f435
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, containing numerous external links to various websites. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The primary attack pattern involves directing users to external URLs, likely for malicious purposes such as phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://crysiq.ru/pbw?utm_term=how+can+i+use+ps3+controller+on+pc PDF link annotation
    • https://static.s123-cdn-static-d.com/uploads/4380543/normal_60b6c75bb6a6d.pdfIn PDF document text
    • https://jagobedumaniso.weebly.com/uploads/1/3/0/8/130873939/7704743.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387933/normal_606d51b112eaf.pdfIn PDF document text
    • https://pikowezapuxo.weebly.com/uploads/1/3/2/6/132681044/2971238.pdfIn PDF document text
    • https://mefosenide.weebly.com/uploads/1/3/4/7/134715399/7047740.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/85bd3c84-2a7f-49d6-b8c4-5f25876c69f1/lebakudonud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/980a10a7-3225-4e91-868a-e90d56a2d765/gmat_official_guide_quantitative_review_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abcc0257-3c96-43eb-89bc-8685c89b1d10/48955033980.pdfIn PDF document text
    • http://pejuzor.pbworks.com/f/como_es_una_bitacora_de_obra.pdfIn PDF document text
    • http://rugewenuzed.pbworks.com/w/file/fetch/144422661/fill_in_missing_numbers_hundreds_chart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7de520a4-73d6-4944-b1dd-0cb6122fe582/resumen_de_la_biblia_catolica.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd91a87a-7424-4f28-8706-4bbd50080a75/destiny_2_whisper_of_the_worm_quest_2019.pdfIn PDF document text
    • http://ropotupi.pbworks.com/w/file/fetch/144497604/nisojoramenoporerigomig.pdfIn PDF document text
    • http://zalonuzojeru.pbworks.com/f/19092950280.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_off0000d783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD783 5024 bytes
SHA-256: 33bf8a9fe56a7a5e0175efb8a30fb2b514d8c34dd335c79e9ca8613cdefe76ce
font_01_sfnt_off0000e8aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AA 10224 bytes
SHA-256: 24180ba1e797f68be0577058c779d5f4b5cfb0e7e1831ee38c7a881e0df94cff
font_02_sfnt_off00010bb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB5 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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