Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a078977e685fb87…

MALICIOUS

PDF

82.3 KB Created: 2021-05-21 12:50:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 81769711cece21fed7e778e4272d7eaf SHA-1: 7fc6cfc4133220c6cc049a84ff9a7268ed5d5821 SHA-256: 3a078977e685fb87a74d0e3073f110dca4cff097b8f40834768275a49526bd29
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, a technique often used for SEO farms or to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to deliver a malicious payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • 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.
  • 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://bologen.ru/strik?utm_term=naruto+ultimate+ninja+blazing+mod+apk+latest+version PDF link annotation
    • https://mosazipabefo.weebly.com/uploads/1/3/4/7/134735261/pisiv.pdfIn PDF document text
    • https://jugijivarute.weebly.com/uploads/1/3/4/6/134620481/9109051.pdfIn PDF document text
    • https://rusajuse.weebly.com/uploads/1/3/4/7/134730125/neparu.pdfIn PDF document text
    • https://tusidotug.weebly.com/uploads/1/3/4/4/134482214/rubuwusuro.pdfIn PDF document text
    • https://kipewupariwigel.weebly.com/uploads/1/3/1/3/131379586/lirurajutu.pdfIn PDF document text
    • https://vivagijep.weebly.com/uploads/1/3/1/3/131383698/xejetefusijob.pdfIn PDF document text
    • https://vuduleputasi.weebly.com/uploads/1/3/4/4/134488699/rugorerakew-pedametebekud-sofuwoxu-dofun.pdfIn PDF document text
    • https://rukusipaxup.weebly.com/uploads/1/3/2/6/132683367/412831.pdfIn 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://s3.amazonaws.com/nisoxow/15565386323.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcaec8f9-6352-46df-80ac-38edd9b5917c/large_dolls_house_furniture_set_bundle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6097a16-5cde-4eee-bcfb-ab853a62d118/zijabefi.pdfIn PDF document text
    • https://s3.amazonaws.com/lolijexejomak/mefujegadexumagup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69e29c29-73e7-4476-b54c-ad205d08883c/is_technical_writing_a_good_career_reddit.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxalirudidel/63278516446.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf83fea7-39a3-42e0-adc0-bb77e44ed92c/17960381121.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abf89c3b-7751-4967-bd2a-c2dc7a6287c4/how_to_thread_a_singer_sew_mate_5400.pdfIn PDF document text
    • https://s3.amazonaws.com/wolina/16400942791.pdfIn PDF document text
    • https://s3.amazonaws.com/mivokozibu/serato_dj_pro_free_download_for_mac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af890511-4ac2-4c91-92b6-255361faac68/toxuxivogofifoxu.pdfIn PDF document text
    • https://s3.amazonaws.com/defipedibe/chrome_remote_desktop_pc_software.pdfIn PDF document text
    • https://s3.amazonaws.com/gofilafixu/22104015820.pdfIn PDF document text
    • https://s3.amazonaws.com/zagubip/endocrine_system_worksheet_grade_10.pdfIn PDF document text
    • https://s3.amazonaws.com/rabewiruzitewa/penguin_readers_books.pdfIn PDF document text
    • https://s3.amazonaws.com/wupagivoz/answer_key_neet_2019_allen_q2.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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E0 2900 bytes
SHA-256: 10a07fc969e6c8cf41398fcfefa625e426b29a45b33f3716d0886db1405c0d2a
font_01_sfnt_off0000f323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF323 5520 bytes
SHA-256: 9e1ae28a4d63acafb89e1b5f29076534996e21672787dbacf5e9c6ef0632cdb7
font_02_sfnt_off000105df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DF 10628 bytes
SHA-256: f23b56a06b6400096f5ab909f01b2cbaf5a87c9cee9b6b9376e346a03b058b29
font_03_sfnt_off00012a28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A28 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176