Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c5230a40356dd31…

MALICIOUS

PDF

119.1 KB Created: 2021-04-10 03:44:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: fc5b983f8d07149d030ce3711d714b82 SHA-1: 9ada5f53808315ee1be7bb60f648082cf79c38f7 SHA-256: 7c5230a40356dd319db637ec7283259b6c05529e6e0c91be2de7d463a2fc3689
206 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, which is characteristic of SEO manipulation or a link farm used to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically classified as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://jumiwimov.ru/strik?utm_term=maxiscan+ms309+manual PDF link annotation
    • https://fokikemapusa.weebly.com/uploads/1/3/1/3/131398543/duzorasukiderog.pdfIn PDF document text
    • https://welajelozasap.weebly.com/uploads/1/3/4/6/134695810/lufamodulu.pdfIn PDF document text
    • https://gubepukabo.weebly.com/uploads/1/3/0/8/130873841/fusofoxugup-xikuba.pdfIn PDF document text
    • https://vuvitolivudiru.weebly.com/uploads/1/3/2/7/132712253/metonobalumugemo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pujifobekef.epizy.com/98304161776.pdfIn PDF document text
    • https://d7ae471b-a447-437d-81b4-4e603f8679d9.filesusr.com/ugd/0a3240_77329de7a10547289f5a41787725b798.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tesapibebujep/asp._net_gridview_sorting_templatefield.pdfIn PDF document text
    • https://6ec3981f-6443-463b-a164-91fc69f101d9.filesusr.com/ugd/7603ae_eac042788edb4b9daf812f5e5137e3b9.pdf?index=trueIn PDF document text
    • http://xofunuxemijowex.rf.gd/python_data_analysis_for_beginners.pdfIn PDF document text
    • http://komorubureg.rf.gd/luvalumokeruxadupijuf.pdfIn PDF document text
    • https://d3dd75b0-514a-4dbf-a1f7-973a5b421fb1.filesusr.com/ugd/5b46ec_eedc0041e0454300bd2ba1c63e8507eb.pdf?index=trueIn PDF document text
    • https://e8f98835-b194-42a5-b43f-fe2f29920dd6.filesusr.com/ugd/bf650e_13020fec95aa4186b4234862eaf9b746.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vuxirefare/how_to_ignore_him_through_text.pdfIn PDF document text
    • https://16cc4848-9a85-487f-bc1d-da55f68f8448.filesusr.com/ugd/dcf86b_0ca6c60da7a843309da6e7bb670c8ee5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/60fbb522-9e05-4655-99a1-3b7fa96ae5fe/what_spine_arrow_for_60_lb_bow.pdfIn PDF document text
    • https://b73db3ac-2e3c-475a-83ab-7f4668f00a8f.filesusr.com/ugd/80e8fa_7e64f2430f684c7dac1d687c10a43794.pdf?index=trueIn PDF document text
    • https://44407f20-7244-4107-9544-84d8151b6f9a.filesusr.com/ugd/8508de_da6c6625c4124f71822caee20dfa39d1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc900d93-dc5d-4871-9328-1b3eebe263f5/45282987897.pdfIn PDF document text
    • https://b3709dad-42f4-4621-9b7e-74d31ca978cd.filesusr.com/ugd/f91cf1_5f334ab4fed941ffb5a0b916b3647e73.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mukut/derivatives_of_inverse_trig_functions_worksheet_with_solutions.pdfIn PDF document text
    • http://lowazuxakosilal.epizy.com/antra_singh_priyanka_bhojpuri_song_2019.pdfIn PDF document text
    • https://91ca87c2-c493-4616-adaa-fbcec45394e1.filesusr.com/ugd/6116da_d0eb2eec7daa4af5a000acaa64bb3b96.pdf?index=trueIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0001b017.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1B017 19120 bytes
SHA-256: 4bdb86189c21f4e615925e242a34f2941841fd40ae434f31f73933fb2602d746
font_00_sfnt_off00017426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17426 5384 bytes
SHA-256: 82954b6094da7e54c9eaaf74431d56bce7ffd5f70c62aadc31c06064f5595b17
font_01_sfnt_off0001866f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1866F 12208 bytes
SHA-256: 2356ff69679af610c734c2f25a6caa1c434da25e96940a288d6cdca0e2549519

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