Malicious PDF — malware analysis report

Static analysis result for SHA-256 3abb04bb21f13c17…

MALICIOUS

PDF

83.1 KB Created: 2021-05-24 06:09:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: b55d61a56249a284acc503ae18103d28 SHA-1: 6f83b6afdf06008721a7b1c6302aeebc266190c4 SHA-256: 3abb04bb21f13c1706c87c735c12006efcd656ba86f0f3b952a9543d87ec70f9
214 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML_NYX_PDF_MALICIOUS and CLAMAV_DETECTION heuristics further confirm its malicious nature, classifying it as a phishing trojan. The document body, though heavily obfuscated, contains text related to 'Numeros divisores de 1212', suggesting a lure to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=numeros+divisores+de+1212 In PDF document text
    • https://lozukiwilef.weebly.com/uploads/1/3/4/6/134644014/wufimonudi-nuwexevaxod-favesejinisofij.pdfIn PDF document text
    • https://rewazute.weebly.com/uploads/1/3/4/6/134648352/5782486.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/zobuwubedak/73850508543.pdfIn PDF document text
    • https://s3.amazonaws.com/dinigugaxej/wamozeninar.pdfIn PDF document text
    • https://s3.amazonaws.com/fidefofudi/21412501159.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17186c5d-1e8f-4aca-993f-a7738ca0507a/64148536341.pdfIn PDF document text
    • https://s3.amazonaws.com/xidazeze/id_card_design_cdr_file.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1771af06-8ea5-4736-86c3-5b576def3fdd/multivariable_calculus_solved_problems.pdfIn PDF document text
    • https://s3.amazonaws.com/tifuwuw/scratch_for_macbook_air.pdfIn PDF document text
    • https://s3.amazonaws.com/wobuzisibal/a_v_r_ka_full_form.pdfIn PDF document text
    • https://s3.amazonaws.com/bulujono/consejos_escolares_de_participacion_social_y_comites.pdfIn PDF document text
    • https://s3.amazonaws.com/vavejijitatofu/wizifitoterizodekuko.pdfIn PDF document text
    • https://s3.amazonaws.com/pekatikisuruki/saa_green_book_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/xopugup/40371001281.pdfIn PDF document text
    • https://s3.amazonaws.com/jazuravazaguz/how_to_connect_logitech_wireless_keyboard_to_amazon_fire_stick.pdfIn PDF document text
    • https://s3.amazonaws.com/gupojakami/apologetica_cristiana_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/remavuj/77339669944.pdfIn PDF document text
    • https://s3.amazonaws.com/sorapobuk/lakevarubowur.pdfIn PDF document text
    • https://s3.amazonaws.com/rewepalazamiso/65237777873.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea653b6c-dc2a-440e-a922-4d622712399d/10701234118.pdfIn PDF document text
    • https://s3.amazonaws.com/pewibim/activex_control_internet_explorer_8.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7982cb1d-7c0e-4235-b438-5750843c0bd6/75281081770.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63448b14-55e0-4279-adb5-1aee77f0e05d/31123861488.pdfIn PDF document text
    • https://s3.amazonaws.com/sikuva/english_grammar_in_use_book_with_answers_and_ebook.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_off0000ee2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2F 4940 bytes
SHA-256: 5bb5c8bbd301c0ffe0bfc452ff52ed1b1cc8900a621e2c666c8a218cb71cac7d
font_01_sfnt_off0000fef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF4 13380 bytes
SHA-256: 5340ec7acfb1431c3f32698a7283b13b0c855d74169ade2f11a5d3553081b41a
font_02_sfnt_off000127af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127AF 16208 bytes
SHA-256: f76e53b1165c770ea72ceccb5e808e1d48d2b426d0b5e274530350a00bad707e