Malicious PDF — malware analysis report

Static analysis result for SHA-256 31f5190c5ee25d7a…

MALICIOUS

PDF

75.0 KB Created: 2021-06-09 15:02:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 37f2ea286e1265d158dac826db350b2c SHA-1: 0b7b9378e0d97d3e92e974ea054f5d46375e517a SHA-256: 31f5190c5ee25d7a561bff8a191633db1013acceb1045fd95a1a624b07b455dc
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://laborke.ru/pbw?utm_term=bd+head+and+neck+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4464995/normal_5fca8265995b8.pdfIn PDF document text
    • https://jejuzuvavat.weebly.com/uploads/1/3/5/3/135384919/c90709.pdfIn PDF document text
    • https://felefufo.weebly.com/uploads/1/3/4/7/134768155/86a890d6fb08d.pdfIn PDF document text
    • https://vewenaloviriwu.weebly.com/uploads/1/3/2/8/132816087/wabegerubiro-pamokesega.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366018/normal_5fe039ac856ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370076/normal_6024f34e01f84.pdfIn PDF document text
    • https://kaperimivegorew.weebly.com/uploads/1/3/4/3/134371305/gogavipob-vijajorixevigeb-kemomarisig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485172/normal_600e30b721fa9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389599/normal_605134c70d961.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423188/normal_6058bda366ec0.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/bda2c905-f5c3-4d7b-862d-e2b4327687c9/29678262177.pdfIn PDF document text
    • http://koruzepuza.pbworks.com/f/wivunoxolo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/baf6cd41-0706-42e7-a1d3-7de768fe7250/hp_photosmart_7760_ink.pdfIn PDF document text
    • http://jitilabajeko.pbworks.com/f/genugibonubikimabadapuli.pdfIn PDF document text
    • http://ziriwuru.pbworks.com/f/88483073423.pdfIn PDF document text
    • http://zuvuzut.pbworks.com/w/file/fetch/144548058/lajaz.pdfIn PDF document text
    • http://febokipup.pbworks.com/w/file/fetch/144666522/rival_18_quart_roaster_oven_instruction_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/103bbc3c-ab15-4207-a708-1df8ef284512/bomutometovelisofomax.pdfIn PDF document text
    • http://ziludezubeju.pbworks.com/w/file/fetch/144463749/libro_de_contabilidad_financiera_de_gerardo_guajardo_cantu_7ta_edicion.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E2 5048 bytes
SHA-256: d329a12ce00d1526e6fb6f1f342515709118748df798633c7c8591dcc083c8b7
font_01_sfnt_off0000e31e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31E 11068 bytes
SHA-256: 93da1037a46b65cc5a00835a4bcd90dd067382bb77187bd4f342f9f6088c2dcf
font_02_sfnt_off00010925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10925 16164 bytes
SHA-256: 4bd16c8abd39118228c1571b0005d4eb3b3e943e572fd92a2a80cfcb7b749349

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