Malicious PDF — malware analysis report

Static analysis result for SHA-256 408f521c4697aadb…

MALICIOUS

PDF

89.8 KB Created: 2021-03-22 02:26:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: fcf91f00e222f1a9352f2daf7e5c6572 SHA-1: 4e3cabc92dceac894b5e46bf53c0fd5b379d92c1 SHA-256: 408f521c4697aadb1374a344897239657150b4408666cad7c5d240b189e55d46
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, indicating a link farm or SEO spam tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While 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 0.9996

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://resalured.ru/award?keyword=analytic+philosophy+a+very+short+introduction+pdf PDF link annotation
    • http://mobufuwiwid.medianewsonline.com/bazevokojukavalenugagesaf.pdfIn PDF document text
    • http://vivudanu.scienceontheweb.net/why_isnt_my_dishwasher_getting_dishes_clean.pdfIn PDF document text
    • http://fofumumitem.medianewsonline.com/seromiges.pdfIn PDF document text
    • https://cdn.sqhk.co/jutusaxibu/Njg1fij/translate_english_sentences_to_japanese_words.pdfIn PDF document text
    • https://cdn.sqhk.co/zetikitor/e4Qgmhg/sing_downloader_for_starmaker_for_iphone.pdfIn PDF document text
    • http://zutumufedige.getenjoyment.net/lewenuw.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://06e27459-8a58-4d01-a48e-f853eab966f6.filesusr.com/ugd/55f1a0_8de81f3d61eb4be1ae75b05551cbc2b7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ecf322c-9e49-4fea-bb03-ad5d25242322/python_dictionary_update_or_append.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/816350fa-85e5-4653-b0d7-6929d096320a/tadoje.pdfIn PDF document text
    • https://6f672a44-e16c-4921-a0f1-e3781c0647c5.filesusr.com/ugd/bda22a_dbe4d941052949d1a7cfa62354e631af.pdf?index=trueIn PDF document text
    • https://cd70d4e5-4a1a-4071-96d1-f2415ea5ece1.filesusr.com/ugd/7f46b5_e8fdb159ebe2408a833aaa4b3de1bbde.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a17a2227-209e-48f0-94f2-a868729147e9/70539959109.pdfIn PDF document text
    • https://acfc0e76-311d-46af-9c13-f46c112eb424.filesusr.com/ugd/f90bad_57e3c3d19ca34dbda3808f8ca9e73792.pdf?index=trueIn PDF document text
    • https://f6180879-d31b-499c-8e42-fead7842c491.filesusr.com/ugd/007227_f6802b5c89fd4d66b3bf5bbf01e5cb9e.pdf?index=trueIn PDF document text
    • http://gabixemi.epizy.com/98989717102.pdfIn PDF document text
    • https://95043331-d9de-4498-ad98-35b8ac3ee23f.filesusr.com/ugd/5740b2_089815eb39d0481cbfd6fdf6c60cff4c.pdf?index=trueIn PDF document text
    • http://fikikozazilut.rf.gd/bookworm_adventure_crack.pdfIn PDF document text
    • https://a0bbd489-bf03-48a0-8e93-88abd0751e5b.filesusr.com/ugd/370ea2_4cd4a1ccd4164813938db419017f1ca6.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000fdd1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xFDD1 14432 bytes
SHA-256: 36d048e86b96e586a9857a504bc7843fea87f6f54b6c6e65cd11f7887e43c624
font_00_sfnt_off0000ebf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF2 5276 bytes
SHA-256: f617d66dece5aa8147d110c30708a2ffe8449833b6907252e905923887f16661
font_02_sfnt_off000125e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125E7 11236 bytes
SHA-256: 7d41079c0e924086d248f5e16e83e9acb8e40ec3fc6906210a453e0f8903ba9f
font_03_sfnt_off00014b0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B0F 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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