Malicious PDF — malware analysis report

Static analysis result for SHA-256 b75a7646909e72bb…

MALICIOUS

PDF

70.6 KB Created: 2021-03-20 07:44:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: af83a9e9a9f669ea8de3b85189455c72 SHA-1: 87650c070d457bb3d30a2113bd111d62381bd8f8 SHA-256: b75a7646909e72bbafcc2a8ede7c52ca3ef09a4a1bdbb9e785ddf74cd6aacd6c
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains multiple embedded URLs, with a primary suspicious URL pointing to 'midufefew.ru'. The PDF's structure and embedded content suggest it's designed to exploit user trust, likely as a spearphishing attachment to deliver a payload or redirect to a phishing site. No scripts were extracted, but the presence of external URIs and the overall detection profile strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://midufefew.ru/strik?utm_term=samsung+hw-j450+remote+app PDF link annotation
    • https://cdn.sqhk.co/zenetofuma/iP9hfjj/cnc_milling_machine_for_home_use.pdfIn PDF document text
    • https://cdn.sqhk.co/ximepadogi/ggMeiKr/arcade_donkey_kong_3.pdfIn PDF document text
    • https://cdn.sqhk.co/naziwixolagu/jjiiif6/20420202099.pdfIn PDF document text
    • http://1xbet-regi.site/antigona_knjigaunby2.pdfIn PDF document text
    • http://registrat.space/xikil4w5gl.pdfIn PDF document text
    • https://cdn.sqhk.co/zobelekivix/YEJjWha/wezum.pdfIn PDF document text
    • http://pitushok.fun/cuanto_mide_una_pulgada_en_cmsqpiho.pdfIn PDF document text
    • http://study-english-05.site/rival_crock_pot_smart_pot_lidm3d3i.pdfIn PDF document text
    • https://cdn.sqhk.co/lewiwifo/ijXhanj/95011877349.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/dotivaf/pojekabirup.pdfIn PDF document text
    • https://4f65703b-d4c0-4c9c-9e30-73c8cc83ec5d.filesusr.com/ugd/54fa57_181f3e589fcd47038cfbc3b9ea26029b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/99b1d7d9-f4b3-459a-9c1a-6791f5c82387/sears_appliance_repair_green_bay_wi.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzakob/81858261415.pdfIn PDF document text
    • https://s3.amazonaws.com/mawesenasijoser/beaker_pro_apk.pdfIn PDF document text
    • https://a6132035-7465-4fe4-be4e-2faa96c22dab.filesusr.com/ugd/cf950b_9e24cc47503f41efbe5df99d7e434d95.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fapaga/hallelujah_trumpet_solo_sheet_music_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5d054bd-d258-46be-b62d-7cb21cbed502/how_to_calculate_the_average_density_of_earth.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14c3361a-57dc-40c0-bf90-2fd335b0adba/jesomuxedepobuxuri.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_off0000d545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD545 5856 bytes
SHA-256: 63fb90a0e70d2b7b4b585ab67e9dc624a1f06b6739188b670fb639aa14616bb4
font_01_sfnt_off0000e92f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92F 10696 bytes
SHA-256: 74e210cb1dcb63e0a69bd6a5baee417e336678f243bc98d8bae4b43740ef52db

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