Malicious PDF — malware analysis report

Static analysis result for SHA-256 7124887562f11263…

MALICIOUS

PDF

136.3 KB Created: 2021-04-02 23:20:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c5e555581f2c90f283351c6f12d6ab5 SHA-1: 9bc8bfae2ccee966006002758fa2ab8e4b494e81 SHA-256: 7124887562f112631a25ec82f30534b723b235bc1f5a6959f3ed1ce259f8ece4
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' confirm the document's purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • 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.
  • 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 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://dafemum.ru/strik?utm_term=actividades+matematicas+segundo+grado+primaria+pdf
    • https://xuduwenonotowud.weebly.com/uploads/1/3/1/3/131379268/4ebb0.pdf
    • http://wovoradomumakil.medianewsonline.com/41235163708.pdf
    • http://gixodugesu.medianewsonline.com/arianna_huffington_the_sleep_revolution.pdf
    • https://setupazaz.weebly.com/uploads/1/3/4/7/134772318/xeriwo_lowifenuviv.pdf
    • http://lopitimew.mygamesonline.org/grade_9_math_worksheets_with_answers.pdf
    • https://cdn.sqhk.co/govizanorev/UjgUun5/istanbul_tourist_guide_book.pdf
    • https://xodimazu.weebly.com/uploads/1/3/1/4/131408168/rutanezusoliteso.pdf
    • https://bawovaleza.weebly.com/uploads/1/3/2/6/132683088/6432228.pdf
    • http://banademebilite.sportsontheweb.net/5733736721.pdf
    • https://tuledekubixa.weebly.com/uploads/1/3/4/7/134722649/kegosizozefo.pdf
    • https://cdn.sqhk.co/wuxaguzifep/e6wEjdk/11062175622.pdf
    • https://pimalikatirowo.weebly.com/uploads/1/3/4/0/134040386/71327d9322.pdf
    • https://muxupodijem.weebly.com/uploads/1/3/4/8/134885552/juwodemuwajexemabu.pdf
    • https://cdn.sqhk.co/nufesewepi/dEgcgjd/how_to_do_a_wedding_cake_topper.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://7095e710-59ac-4d27-8a5a-f3bbcaf65deb.filesusr.com/ugd/418e76_2564cc1a198047a69a5780bed4e4a221.pdf?index=true
    • https://21a67f6d-2aea-439f-a910-ed4feb6be009.filesusr.com/ugd/173616_10cc24f0e4834c7dad2c928b14cb7cfa.pdf?index=true
    • http://vuzuwukef.atwebpages.com/wika_pressure_transmitter_s_10.pdf
    • http://bogizun.epizy.com/bushido_blade_2_psx.pdf
    • https://af18ad75-7652-4b25-b9e0-8da5fded0af1.filesusr.com/ugd/529385_248f4b3930da4ec283c73d907ff1fa21.pdf?index=true
    • http://vidojizo.rf.gd/sawigukifov.pdf
    • http://nivobilov.epizy.com/98425592265.pdf
    • https://26c1613e-5d28-4fa3-89cb-3d2c9ab59faf.filesusr.com/ugd/fe83c3_3a3318e9bf8f49dab1f685907a0efec0.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001d563.bin
46793faa596827535f1f4d1e5cf103ae32c88487cbfba9f61aeaf834696f19fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1D563 5492 bytes
font_01_sfnt_off0001e804.bin
f8d05101ae5705492122e5a3582eea41689a5efc013b5018f76d1bb8820a1a77		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1E804 12384 bytes

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