Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1a0ecd4e3454f2f…

MALICIOUS

PDF

104.2 KB Created: 2021-03-31 05:05:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 563d60ee571ef9ce7b0f2dcc1f63097e SHA-1: c5e419cb3825cf3bb1e9a3be76dab960513c236f SHA-256: e1a0ecd4e3454f2f853e2a6164f2c8f2d6a4fd68942642699d38ed84707ec1d2
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://midufefew.ru/award?keyword=physics+textbook+for+secondary+school+pdf+download PDF link annotation
    • https://pilologalegalek.weebly.com/uploads/1/3/0/7/130740349/mopeboj_jurojiwonol.pdfIn PDF document text
    • https://tevaxuxelajuri.weebly.com/uploads/1/3/2/7/132712575/2934470940e4.pdfIn PDF document text
    • https://cdn.sqhk.co/letojeka/ggegh40/starz_power_2019.pdfIn PDF document text
    • http://nivawegokex.22web.org/free_dictionary_for_java_phone.pdfIn PDF document text
    • http://kefuxew.22web.org/gobarefamukutagubexuk.pdfIn PDF document text
    • https://boseveju.weebly.com/uploads/1/3/4/5/134595203/cc28f947faa9d06.pdfIn PDF document text
    • https://cdn.sqhk.co/savujegu/ibjj56h/flip_runner_mod_apk_1._1._10.pdfIn PDF document text
    • https://cdn.sqhk.co/norumuwapa/PoqfOjg/94736662400.pdfIn PDF document text
    • https://cdn.sqhk.co/xovikojux/sjfVCgg/agar._io_vs_slither._io_vs_diep._io.pdfIn PDF document text
    • https://sasominafa.weebly.com/uploads/1/3/4/3/134362810/b73e487286b01.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nominexi.epizy.com/xijowoxosoxake.pdfIn PDF document text
    • http://dojiseb.epizy.com/87801001367.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d0c8549-2b64-43a4-95bc-68651f087030/black_and_decker_toaster_oven_cleaning_instructions.pdfIn PDF document text
    • https://6c8027e1-9878-41b3-a9ef-32ba2b6bcd02.filesusr.com/ugd/185811_7dd84fe0fdb14f558bb3f6e2699369d8.pdf?index=trueIn PDF document text
    • http://xobiluwova.epizy.com/98445696215.pdfIn PDF document text
    • http://zotubetujuna.rf.gd/pubawemu.pdfIn PDF document text
    • https://d7ae471b-a447-437d-81b4-4e603f8679d9.filesusr.com/ugd/0a3240_39913ed720e64c23be9861e0f42cda22.pdf?index=trueIn PDF document text
    • https://14da0a27-f261-4d4b-8668-3a369f5c966d.filesusr.com/ugd/46429b_7e1161bc01ae45cab7c0d1b5599ece9a.pdf?index=trueIn PDF document text
    • http://jerolap.rf.gd/sample_behavior_intervention_plan_for_emotionally_disturbed_students.pdfIn PDF document text
    • https://39c1d623-eccb-4af0-a86a-15328a2d61f9.filesusr.com/ugd/3cb6cb_a7d5eb5ab3b84752b4adeb835e69826c.pdf?index=trueIn PDF document text
    • http://tedipokexumo.epizy.com/30026490288.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a130a4fa-13a1-4bf7-8305-47e3a0c2b25b/62998455267.pdfIn PDF document text
    • http://soreras.epizy.com/xejumo.pdfIn PDF document text
    • https://2df7536a-ab64-4dd3-a6ca-98e0eca144a4.filesusr.com/ugd/de578f_368e78427ad24814aa5628818043d0b7.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000158d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158D3 5712 bytes
SHA-256: e79f71aba00fe4fba3f0cfa8c2f5ca5f40f848b8c93c9e536875c1e9aea488b6
font_01_sfnt_off00016c56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C56 11000 bytes
SHA-256: ae9edf17a7d398fafc017179d704e6dadb8e2a088e8dbbbac32b606d39886f3c