Malicious PDF — malware analysis report

Static analysis result for SHA-256 02d789b18dfb93ce…

MALICIOUS

PDF

89.5 KB Created: 2021-05-11 19:52:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 23fc0916a979998acfe5084bea1a06fe SHA-1: d5cedcb14557f4b64300e42ae6f50402f0b31198 SHA-256: 02d789b18dfb93cef7f50f8c02f57c4d2b4a2a21115e9b397c3bb984e8b9f6c0
186 Risk Score

Malware Insights

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

The PDF file contains a link farm designed to redirect users to external websites, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The primary malicious URL identified is https://resalured.ru/strik?utm_term=little+house+on+the+prairie+season+10+episode+1, which is likely part of a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the presence of numerous external links and the ML_NYX_PDF_MALICIOUS and CLAMAV_DETECTION firings strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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 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://resalured.ru/strik?utm_term=little+house+on+the+prairie+season+10+episode+1 PDF link annotation
    • https://mexasazage.weebly.com/uploads/1/3/4/5/134513067/madasodudobubov.pdfIn PDF document text
    • https://supogile.weebly.com/uploads/1/3/1/6/131606666/tiwigiriri.pdfIn PDF document text
    • https://cdn.sqhk.co/pazaxefuma/8Egdbhb/42084111419.pdfIn PDF document text
    • https://gumabudisipinef.weebly.com/uploads/1/3/2/7/132712006/372c40f210.pdfIn PDF document text
    • https://cdn.sqhk.co/besogevipadi/EfoFgcy/ping_pong_pc_game_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/tinodifozeza/e4HgdeT/6319065759.pdfIn PDF document text
    • https://zawiwiguxasawum.weebly.com/uploads/1/3/0/7/130739629/pitasilunodose.pdfIn PDF document text
    • https://diwowure.weebly.com/uploads/1/3/4/5/134592565/kabipex_bezisofugifokuz.pdfIn PDF document text
    • https://vinokiwofexuge.weebly.com/uploads/1/3/6/0/136095936/52751.pdfIn PDF document text
    • https://cdn.sqhk.co/xetajikok/zigSGgg/vafivawal.pdfIn PDF document text
    • https://sijudunewofas.weebly.com/uploads/1/3/4/6/134696620/sebumasifuz.pdfIn PDF document text
    • https://linefalaxig.weebly.com/uploads/1/3/2/6/132682404/lebaf.pdfIn PDF document text
    • https://cdn.sqhk.co/givesaxi/hzgi41i/global_sporting_events_ltd.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/28f69763-09c8-4292-a867-2fda7331da5f/what_is_ict_computer_virus.pdfIn PDF document text
    • https://s3.amazonaws.com/nodetuxapabara/bestanden_samenvoegen_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0819a1f-0292-49a3-859d-0c7c97f3bf63/buvuriz.pdfIn PDF document text
    • https://s3.amazonaws.com/jalasilunaz/92918255391.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8989e18-48e6-442b-8019-8370d4826c22/kenmore_coffee_maker_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9db6a328-deb0-4fa8-934f-c7c26af70f34/dr_maxwell_maltz_psycho_cybernetics_deutsch.pdfIn PDF document text
    • https://s3.amazonaws.com/lodazojamuva/25057647356.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/football_manager_2015_download_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/gelawiweza/wiring_diagram_micro_usb_connector.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/406058cd-3e1c-4c0a-9e9d-4c334728cee6/does_judge_judy_show_pay_the_fines.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_off000109a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A5 5180 bytes
SHA-256: 57c8358c25670c5b4046c7919e5028c3384858c6543af058f40b91577194f09c
font_01_sfnt_off00011b3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3B 12072 bytes
SHA-256: 163b8ba365959ed73639c579f42b4ed6ddc425cd2ffbd0cf92faadc40bde3021
font_02_sfnt_off00014348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14348 16060 bytes
SHA-256: 99ddc6f5858eb134f8024171ebe717cbd02485c31471b921a5021903b5272953

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