Malicious PDF — malware analysis report

Static analysis result for SHA-256 e920051165fd656b…

MALICIOUS

PDF

128.1 KB Created: 2021-04-24 21:16:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 639d9316255a58ee1547fdc8485ec02f SHA-1: afb1ae7a07c0f9f4fb0bb226dd52700eb48ca957 SHA-256: e920051165fd656b26b8c92ac16e6b0847aa86e091c765f8514f044096a02c3d
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The primary URL, 'https://xajibur.ru/strik?utm_term=fullstack+react+pdf+2019+download', is likely part of a phishing lure.

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://xajibur.ru/strik?utm_term=fullstack+react+pdf+2019+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481282/normal_605e0fbc38ed4.pdfIn PDF document text
    • https://tiwirekofer.weebly.com/uploads/1/3/5/3/135314588/c6bbefc5485.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417024/normal_603af2e78b1e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368467/normal_601f28095dc1b.pdfIn PDF document text
    • https://jorojesa.weebly.com/uploads/1/3/4/8/134861508/xedidebozibumu_xerise_ribubek_xuxip.pdfIn PDF document text
    • https://pedigujelod.weebly.com/uploads/1/3/4/0/134096449/3947927.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404965/normal_602abe8b5e07c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496225/normal_6069b8e436f56.pdfIn PDF document text
    • https://cdn.sqhk.co/vojazodelud/heKjgMg/skins_for_roblox_project_pokemon.pdfIn PDF document text
    • https://badosesidexezub.weebly.com/uploads/1/3/0/8/130874160/81eb5104ee2e1f6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392658/normal_600647573ae38.pdfIn PDF document text
    • https://cdn.sqhk.co/fufowomusixi/afxiaij/filling_small_holes_in_sheetrock.pdfIn PDF document text
    • https://pejunujatajobu.weebly.com/uploads/1/3/5/9/135973135/4508c18b5101.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484370/normal_60198a630be7d.pdfIn PDF document text
    • https://falototadapi.weebly.com/uploads/1/3/3/9/133989324/zawavaga-lijakajavesel-tepulis.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387817/normal_6001a74cd89d7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jejulurowev/bogoshipda_piano.pdfIn PDF document text
    • https://s3.amazonaws.com/nazekisigiduz/how_to_open_top_of_maytag_centennial_dryer.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/killing_pablo_movie_2011_download.pdfIn PDF document text
    • https://s3.amazonaws.com/gewisetug/weserabosuwajepedax.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_off0001b64a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B64A 5744 bytes
SHA-256: 519d96ee4de31cefdc837a175ea563d634f3d217d4f65a1670d985eabc21c26a
font_01_sfnt_off0001c9fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C9FB 12100 bytes
SHA-256: b6ea833c1b4fcc6caa54508cf600e990010f596a26ab48267c264befd0303f71

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