Malicious PDF — malware analysis report

Static analysis result for SHA-256 21a4eabe509a38ea…

MALICIOUS

PDF

83.3 KB Created: 2021-03-14 09:46:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 6559371a9f29a62517dab594681f6b0e SHA-1: 28c93970a3bf2e0af1af3b39d16d30f47d3293b2 SHA-256: 21a4eabe509a38ea0c3daffdde044eff271f6a4097975ee906dc3af2b0e00fd5
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting or redirectors, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://xajibur.ru/strik?utm_term=los+verbos+irregulares+en+ingles+lista PDF link annotation
    • http://sigonalen.22web.org/canada_visa_application_form_indonesia.pdfIn PDF document text
    • https://jotozured.weebly.com/uploads/1/3/4/5/134588142/filasomovona.pdfIn PDF document text
    • https://xufipenisugiw.weebly.com/uploads/1/3/0/8/130873979/578253.pdfIn PDF document text
    • https://vematonejos.weebly.com/uploads/1/3/1/3/131383464/8848420.pdfIn PDF document text
    • https://gosasolana.weebly.com/uploads/1/3/4/5/134523876/6b899103c0a6.pdfIn PDF document text
    • https://cdn.sqhk.co/kodivitedi/6njdJJd/dragon_age_elves_immortality.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwonumatag/GOjf4hh/55410645409.pdfIn PDF document text
    • https://lajexupizad.weebly.com/uploads/1/3/0/7/130775806/bujawizagore.pdfIn PDF document text
    • https://cdn.sqhk.co/wedifedaguju/hzgeLgi/colors_that_go_with_red_and_white_clothes.pdfIn PDF document text
    • http://velibabup.iblogger.org/jungle_animal_coloring_pages.pdfIn PDF document text
    • http://nekimul.22web.org/how_to_watch_star_wars_canon_in_order.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/3208492d-2b4d-451e-b60e-0916128925ea/wulavekotewedijorulo.pdfIn PDF document text
    • https://13cfbe10-32e4-4d7a-9072-8dbd3280e6b8.filesusr.com/ugd/994e9e_e21b0ca12a8744efaaa9fb9ed103dcf4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/54209590-58a8-407b-ad15-748f30edc7e4/kowuxololeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28f8a311-5445-48b6-9603-a3d8eaa54df5/default_username_and_password_for_xerox_workcentre_3215.pdfIn PDF document text
    • https://ef2e072a-e8a2-4438-804d-cc750be2e2f6.filesusr.com/ugd/6a22cb_02a8f747b89d4c8a930c20fab9a2a540.pdf?index=trueIn PDF document text
    • http://detuzojezil.rf.gd/gewepiboxakozinosabu.pdfIn PDF document text
    • https://caa91486-5fcc-43b7-8b2b-5b817ae85bbe.filesusr.com/ugd/26bbcf_a5905407708a47398fbfa1799e0cf970.pdf?index=trueIn PDF document text
    • https://5ce19dfa-329f-495d-88d1-e1e7834d9072.filesusr.com/ugd/d902bb_2543d5c8a3f043e49928920553adc4ac.pdf?index=trueIn PDF document text
    • https://3064a0a7-8496-4b95-be1e-56094aee372f.filesusr.com/ugd/0cf4b9_436619c405c24adc881df52b4e60cc70.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f08e6184-87c9-4352-a3b3-a2d5126e711a/someday_someday_maybe_summary.pdfIn PDF document text
    • http://roditopimisovo.rf.gd/27458510591.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d775016f-4dbb-4842-83a9-7761c1ea4b50/12699781444.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_off0000f332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF332 4992 bytes
SHA-256: 9ef9443c485f2811bcc696ebb88ce3ce707120ad20fd3fdf888091f7760a30a9
font_01_sfnt_off00010447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10447 10468 bytes
SHA-256: cc0793b088e9e01f7273b2f594faba41a78e896dc06e59193998bede9532c597
font_02_sfnt_off00012826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12826 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15

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