Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2570dfb0afab138…

MALICIOUS

PDF

84.5 KB Created: 2021-06-09 22:44:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4e21bd177e9fbd23bfdc0da597054ddc SHA-1: e137a292955fe20fbdcc2e28a7882b5734631d82 SHA-256: a2570dfb0afab138d24217bf90621cae3d9f918c88a613648089dc405f9738ae
164 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jacksth.ru/123?utm_term=bhai+bolte+hai+ringtone PDF link annotation
    • https://saworajopasu.weebly.com/uploads/1/3/0/7/130775294/dekifizazebo.pdfIn PDF document text
    • https://jerepuda.weebly.com/uploads/1/3/4/7/134745202/0b4df53374d86.pdfIn PDF document text
    • https://vabusise.weebly.com/uploads/1/3/4/3/134385335/sikagifusob_zenipomopazavop_burisotifeg.pdfIn PDF document text
    • https://xivenisulebitok.weebly.com/uploads/1/3/1/3/131378814/kasefonifalu.pdfIn PDF document text
    • https://zobatovegu.weebly.com/uploads/1/3/0/8/130873738/joxosazofupadenosiw.pdfIn PDF document text
    • https://linonorimezolup.weebly.com/uploads/1/3/7/5/137519838/6895731.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ee3ca86-1070-40d8-98c6-fc1c42eb305f/what_makes_a_good_persuasive_speech_topics_for_college.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bef8613d-dd87-4532-9adf-fa6ba51a7acb/jeluweloxutusejerek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ccb5035-4d1e-41e1-a21d-aef99ebbd131/57155340002.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86a76fe3-8b66-4912-a173-c97d65734aaf/rikidesoli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e100382e-63e2-499e-89a3-aeedb443ee01/iphone_5_all_parts_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/698af8e2-ea11-46e3-8921-1a120f8a0c0c/89613026708.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92c0ccc9-8227-480d-af05-7d387f7749cb/salvage_title_2010_camaro_ss_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bba38ea6-3fcb-4260-86db-8fbea3209593/tracfone_lg_premier_pro_plus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b75c793e-f5f8-4c88-b754-9ad896c201e6/3128617302.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a39e701-2ce4-47f4-9f3c-f17596f7d2c1/40644629055.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7e2063b-1998-4f59-9838-cad271362608/14557221035.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45b2b963-fcb9-4144-81d1-6a0fb349ee88/ganolekakodiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5db03809-8f95-47b4-ac05-c66c97ba4cda/19228572982.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c6af70e-dd66-413a-ac2d-ed6da1c02b70/pijukasezuxibodabupivu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ae3570b-315f-4bb8-845b-a1d938a1615c/rutupe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b83f677b-709f-40d1-aeb1-60c45903d5b9/caster_disney_sur_freebox_revolution.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_off0000f31e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31E 4960 bytes
SHA-256: c8fd8ef1da4b1e4b70c3af28b461e8a68292ec3dcd4ff4fe46dceac99b8ab2fd
font_01_sfnt_off000103f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F7 13168 bytes
SHA-256: fd96e4a4b0cc28700e3874b1f7b701b7cf52113112c0021ad74d9f25fb2d26ef
font_02_sfnt_off00012f2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F2E 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e