Malicious PDF — malware analysis report

Static analysis result for SHA-256 de3f882630c68c71…

MALICIOUS

PDF

113.5 KB Created: 2021-04-06 23:25:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 1a1d06d7e06cdcd8414f53e726efe548 SHA-1: 0055e44b371156f223e889b6094155cac502fee2 SHA-256: de3f882630c68c713cc812a0a56ce6dddaa373297d72c5d93e5550f2bab8f597
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The file contains a large number of external links, suggesting it functions as a link farm, potentially for SEO manipulation or to direct users to phishing sites. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' strongly support this attack pattern. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • 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 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://druttle.ru/award?keyword=carbohydrate+chemistry+book+pdf PDF link annotation
    • https://morowuze.weebly.com/uploads/1/3/4/5/134580979/vosigababekudugi.pdfIn PDF document text
    • https://jejademi.weebly.com/uploads/1/3/4/2/134266227/2361900.pdfIn PDF document text
    • http://bestita.space/3915274564ddzm8.pdfIn PDF document text
    • http://floradoma.net/computer_hardware_course_online_free_in_tamilrriix.pdfIn PDF document text
    • http://xopoxek.iblogger.org/bizoguguxisazoxajabej.pdfIn PDF document text
    • http://lumapon.iblogger.org/xegudozanejebenofo.pdfIn PDF document text
    • http://limaxinsto.xyz/bootstrap_form-_group_row_colkw3de.pdfIn PDF document text
    • https://mojetene.weebly.com/uploads/1/3/5/9/135957439/bc955.pdfIn PDF document text
    • http://znasila.ru/3d_sierpinski_gasket50tb5.pdfIn PDF document text
    • http://vvd.bar/sca_jump_starter_keeps_beeping3cns2.pdfIn PDF document text
    • http://sipivide.iblogger.org/55599277837.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/zafijukopa/zero_calorie_food_list_india.pdfIn PDF document text
    • https://4adff18d-dc39-4349-be2c-eeb12737f1cb.filesusr.com/ugd/9117e0_2969e1fabe6d45649fa0738bbb66eee0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/widetunipet/wupikerixefujube.pdfIn PDF document text
    • https://add83a7c-0e31-48b3-928b-061d82ba9144.filesusr.com/ugd/205ae4_ae4ef53948064587955ebe28ce34e539.pdf?index=trueIn PDF document text
    • https://592f3795-292b-4eb7-bb82-ca7d83343d16.filesusr.com/ugd/44d997_098de72072a048768b08f050a3b111df.pdf?index=trueIn PDF document text
    • http://monovopo.rf.gd/ruzutebon.pdfIn PDF document text
    • https://s3.amazonaws.com/jazofi/6121434801.pdfIn PDF document text
    • http://xonizud.epizy.com/checkers_strategy.pdfIn PDF document text
    • https://abf133a7-37c0-4616-b653-d99fd306bce3.filesusr.com/ugd/5c8236_779ffaba71dd4346bb0f9183a2ee01ea.pdf?index=trueIn PDF document text
    • http://ruxemad.epizy.com/malaysia_immigration_questions_and_answers_for_tourist.pdfIn PDF document text
    • http://rivebop.epizy.com/70945473112.pdfIn PDF document text
    • https://ee897e78-a157-4eb5-8a47-d615096087a2.filesusr.com/ugd/113e89_a459fc2bda0242cabbdc1b6613e1b1bb.pdf?index=trueIn PDF document text
    • http://wixujovevimaba.epizy.com/safety_technician_job_description.pdfIn PDF document text
    • https://s3.amazonaws.com/tonemakopinibem/texas_treasures_3rd_grade_reading_book.pdfIn PDF document text
    • https://s3.amazonaws.com/gogonof/81194553098.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_off000166bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166BC 5572 bytes
SHA-256: e1f9a80b91d22207b77669197f8b03dbcb1dfe78b67c419ac1c169dc4d25eadd
font_01_sfnt_off00017985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17985 11956 bytes
SHA-256: f64f3820a8ee012e7222f868c58fd48e6a0fb38a0047e1cea17d7d501786f1e6
font_02_sfnt_off0001a287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A287 16184 bytes
SHA-256: f375f760f39963ce4bd6e9eb2d56ec9aee132766bcb2b6ca8a90c51d53fc5f7d

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