Malicious PDF — malware analysis report

Static analysis result for SHA-256 37fb2a74e463d1a5…

MALICIOUS

PDF

77.5 KB Created: 2021-02-28 12:15:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ca9ee84bf2c26a2732d8b9ca413172d5 SHA-1: b09ab02e958132ed2a4d0269811cfaa34f1ba84a SHA-256: 37fb2a74e463d1a5051094124b7fc2cc8962bd5080d22112bc008cd81d0d99a5
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous external URLs, indicating a likely attempt to redirect users to malicious sites. The PDF structure and embedded URIs suggest it functions as a link farm, potentially for phishing or distributing further malware, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/strik?utm_term=sony+fs5+internal+battery PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4448536/normal_5fda321b7902e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415756/normal_5fcfa6e13598a.pdfIn PDF document text
    • http://teachost.com/levons_les_yeux_voici_la_vraie_lumiuw9wq.pdfIn PDF document text
    • https://mipikarekegimo.weebly.com/uploads/1/3/1/6/131606279/9812192.pdfIn PDF document text
    • http://com-signto6.xyz/photoshop_make_color_splash_effectzntfs.pdfIn PDF document text
    • http://votixibutiro.medianewsonline.com/velibitot.pdfIn PDF document text
    • https://jomefexud.weebly.com/uploads/1/3/4/7/134732593/5603164.pdfIn PDF document text
    • http://forexgeeks.net/39577021945n8huh.pdfIn PDF document text
    • http://confirmyourverifiedbadge.com/dofuzerevedafesogojivmqlom.pdfIn PDF document text
    • http://apparently-home.com/terraria_new_worlds_download9855o.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495526/normal_5fe4a8b631781.pdfIn PDF document text
    • http://nasufulorejuwe.mywebcommunity.org/fl_studio_tutorial_hip_hop.pdfIn PDF document text
    • http://itanto.space/les_miserables_25th_anniversary_concert_soundtrack_download3pd6o.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478133/normal_60045ed4b78ee.pdfIn PDF document text
    • http://it50life.pro/guvodutudevawvylm5.pdfIn PDF document text
    • https://lepoxaxilil.weebly.com/uploads/1/3/4/4/134498836/b2451e.pdfIn PDF document text
    • http://nebofimanigi.sportsontheweb.net/how_to_draw_a_cartoon_turkey_steps.pdfIn PDF document text
    • http://giwapozolaleg.mypressonline.com/peavey_classic_50_50_power_amp_for_sale.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/pewebopufupe/bonarusegusezizugototor.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/xibuwanukesagufenemefo.pdfIn PDF document text
    • https://s3.amazonaws.com/jukezeluf/the_mysterious_benedict_society_movie_dream_cast.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_off0000f0e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E3 5232 bytes
SHA-256: 4142e5527792104d5aa44d4cf656831cc7ec398514a2d626a779b281759da1bf
font_01_sfnt_off000102ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CE 11296 bytes
SHA-256: 998baae5e325f8b6cd24022e9e997cbc81ba59941bad747ea187a3ec6fe38afc

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