Malicious PDF — malware analysis report

Static analysis result for SHA-256 b25662ddd8490113…

MALICIOUS

PDF

78.4 KB Created: 2021-03-22 11:04:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 175d84c0a619fbae1e78b9aebe9b6899 SHA-1: 573b6faf0ff0e2807923548a292951cf057c38a3 SHA-256: b25662ddd8490113e48960bc75abfd5c6d3d0df759bd0784485d1b3d666d590a
156 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 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 0.9996

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 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.
  • 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://resalured.ru/strik?utm_term=whirlpool+front+load+washer+parts+near+me PDF link annotation
    • https://danexuxubusam.weebly.com/uploads/1/3/2/6/132695747/7cf9619d7bdb3.pdfIn PDF document text
    • https://berapozi.weebly.com/uploads/1/3/0/7/130776213/kenuzidedanifosudaxi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409814/normal_5fd3c5bf963eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415052/normal_60354a04dccae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393641/normal_604f10886fa52.pdfIn PDF document text
    • http://pavedewono.iblogger.org/what_is_the_cottage_law_in_texas.pdfIn PDF document text
    • https://dosedoduni.weebly.com/uploads/1/3/4/3/134347632/93829a9d0834ad4.pdfIn PDF document text
    • https://duvigenusidila.weebly.com/uploads/1/3/4/7/134736387/kejej.pdfIn PDF document text
    • http://kugenezajiz.22web.org/java_8_lambdas_github.pdfIn PDF document text
    • http://ladidoxa.iblogger.org/foxugorid.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f61a8d15-835b-4c36-a3db-e4ead73ab13f.filesusr.com/ugd/e9f5f3_f62b22ff55d345d6a17517238c950cf4.pdf?index=trueIn PDF document text
    • https://8f7ea519-0f04-4608-87c3-d83a7406251f.filesusr.com/ugd/2d1648_acc72e6c280a4da699ea02d87737bb88.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mejifavo/online_bible_study_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a036f2e-1de8-4c3c-a82d-dcf4c1a8b2e2/panchatantra_tales_in_hindi_with_pictures.pdfIn PDF document text
    • https://s3.amazonaws.com/tumasun/square_pos_app_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/tejuvonixag/update_instagram_app_apk.pdfIn PDF document text
    • https://48cc712b-de5e-493e-a198-f8962849e22b.filesusr.com/ugd/d2751c_110ff912b8fd44d09b598958ba6fac11.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ad8b35c-fbf6-46e9-ad68-4edd4195749b/google_search_image_resolution.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb0968df-3107-4731-b2cd-162363a19e60/51305527241.pdfIn PDF document text
    • https://6184de0c-c318-42a7-882e-c5ddc63b817d.filesusr.com/ugd/1c8c1e_3400e7b04f1e4086ba8d9f4e72802035.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ab2a92a-7929-49e1-8e2b-fe45e46e6f5b/how_to_unlock_microsoft_word_selection_is_locked.pdfIn PDF document text
    • https://s3.amazonaws.com/dudurat/zoluvudodagasisijojew.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_off0000f591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF591 5388 bytes
SHA-256: d10c4981363f2fee7610d7a6c2e9e968909d2f042e76ae6e1df456766a3fb910
font_01_sfnt_off000107d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D0 10492 bytes
SHA-256: 3fcb667fd3d34158808c028df347271bc4f4c1a434720a1cb04dd8a8a111703a

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