Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a94ab590207414a…

MALICIOUS

PDF

85.8 KB Created: 2021-03-22 13:13:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 592e3bd469bd0c50a1c4f4a8b3a1343f SHA-1: d1f88532b158932009b2fa21556265fde98ea8a8 SHA-256: 3a94ab590207414aa7bc67d3f67fa7b67ea190e36cb05629ebbc542a1bc65d67
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to Weebly and other free hosting services, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of an attempt to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/aws?utm_term=are+rca+tablets+good+quality
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/pomerarusi-razike.pdf
    • https://bugajikiwolano.weebly.com/uploads/1/3/4/4/134471946/1415495.pdf
    • http://watulexop.iblogger.org/denifodizale.pdf
    • https://pumijisiror.weebly.com/uploads/1/3/1/3/131381241/gisofinarukafujibib.pdf
    • https://kexoxuneve.weebly.com/uploads/1/3/4/5/134501441/walezutisavomakuve.pdf
    • https://kepiloxuxamife.weebly.com/uploads/1/3/0/7/130740378/novofo.pdf
    • http://noseparelal.iblogger.org/21093415580.pdf
    • https://bipuvoru.weebly.com/uploads/1/3/5/3/135336843/f6a8acef9c1b.pdf
    • http://gonosijotu.iblogger.org/what_happened_in_1500_in_american_history.pdf
    • https://juwibaviwexufeb.weebly.com/uploads/1/3/0/7/130739975/125bc8.pdf
    • http://juwijosij.iblogger.org/53221067010.pdf
    • https://valuluxunu.weebly.com/uploads/1/3/2/7/132710491/sakuvex.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://dukizovisepo.rf.gd/homedics_cool_mist_ultrasonic_humidifier_reviews.pdf
    • http://gazunobopa.epizy.com/varozezizazukobimox.pdf
    • https://uploads.strikinglycdn.com/files/f7b34ec3-1398-4abc-afc4-09a43c2d5972/gravity_falls_journal_1_2_3_ebay.pdf
    • https://uploads.strikinglycdn.com/files/410340ec-213d-4350-ae55-1e63c25f6f62/irregular_preterite_verbs_list_spanish.pdf
    • https://uploads.strikinglycdn.com/files/58a2dfaf-d5a0-47fc-bc84-2f2c3e9645a1/12448116699.pdf
    • https://uploads.strikinglycdn.com/files/947b6741-3b50-4b55-918b-1d8663ae6861/380395425.pdf
    • https://uploads.strikinglycdn.com/files/cc1f623e-ccdb-45b0-9eea-d8fa431492b5/kulup.pdf
    • http://norisufa.epizy.com/basic_structure_of_sql_queries.pdf
    • http://telawusufolij.epizy.com/android_file_transfer_for_windows_xp.pdf
    • https://uploads.strikinglycdn.com/files/7e3a2616-ef88-48a9-adce-4fbf8667aa5f/technical_report_writing_engineering_examples.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001126c.bin
5c6423b88078f175ef4a971a8958d832d1265255caa3f768f03320c2f988d460		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1126C 5464 bytes
font_01_sfnt_off00012501.bin
0797d8c945ecba8eafaa3f667b7406c704daed1ad8e4bd4c9296230901e71f78		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12501 10812 bytes

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