Malicious PDF — malware analysis report

Static analysis result for SHA-256 b488a15d7d8cff04…

MALICIOUS

PDF

92.8 KB Created: 2021-03-12 05:04:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: fbf1ad97e58232c4a95a0719427cf4d2 SHA-1: 96c30e8563f739fe0abf633f79ab0c243f2d43c3 SHA-256: b488a15d7d8cff0458b0ebfe55cbecfe7a9b940735b6ac79032fc574557a7575
204 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains multiple external links, with one heuristic specifically identifying a large PDF link farm. The document body, though heavily obfuscated, contains text related to 'annual return gst excel format', suggesting a lure for financial or tax-related information. ClamAV detection and ML classification strongly indicate malicious intent, likely to download a second-stage payload via the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://jumiwimov.ru/123?utm_term=annual+return+gst+excel+format PDF link annotation
    • http://mon-cmbretagne.com/short_curly_haired_big_dogspm8wj.pdfIn PDF document text
    • http://jemulobapamiwu.mywebcommunity.org/weight_loss_calculator_after_gastric_sleeve.pdfIn PDF document text
    • http://podarokinsta365.site/cfd_solidworks_tutorial84g4c.pdfIn PDF document text
    • http://pogawubujogeje.mypressonline.com/sikavotikigixivuxevafese.pdfIn PDF document text
    • http://faxusupovetek.sportsontheweb.net/what_is_the_salvation_doctrine.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vidugozu.atwebpages.com/sagiwikelunufokesedawita.pdfIn PDF document text
    • https://s3.amazonaws.com/jenisozazewubo/25356095140.pdfIn PDF document text
    • https://s3.amazonaws.com/kabisebax/what_is_your_personal_philosophy_of_leadership_why_what_are_your_beliefs_about_human_behavior.pdfIn macro / runtime command snippet
    • https://e8b83640-91e4-44a0-a69f-c2468797902f.filesusr.com/ugd/ee4a13_26318e51edd544818de307a5e14f93e0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b85e9cc-9b6f-4f5b-8ae6-5ead0f6cdef7/delonghi_oil_heater_1500w_harvey_norman.pdfIn PDF document text
    • http://tixofimisupabev.onlinewebshop.net/vidiberuzujusigozeganixo.pdfIn PDF document text
    • https://ba739632-11db-41f7-a023-683a20e55d36.filesusr.com/ugd/99835b_35d9e11e5d494c2f847c56b474177ecf.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jezaxojipevu/telugu_movies_with_english_subtitles_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbbe4297-cb44-478a-bbcb-66cf35658c7e/realidades_2_capitulo_1b_practice_workbook_1b-6.pdfIn PDF document text
    • https://s3.amazonaws.com/rovuweraja/insert_sheet_name_code_in_excel_header.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d72dd915-5256-45f6-b5a7-4e828124b134/is_a_yamaha_r6_a_good_first_bike.pdfIn PDF document text
    • https://da89e6ec-52f9-4c28-8de8-447a2e923c0c.filesusr.com/ugd/5e5b2a_0a04e89745094dd1986f2cec1727e1fb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/amazon_prime_video_apk_mod.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
    • https://s3.amazonaws.com/jeniIn macro / runtime command snippet
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012fd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD5 5256 bytes
SHA-256: 12eb123e9f08eba5672f14e64dddc20f1f8dfb096d557b8ae7cca4ed79d063c6
font_01_sfnt_off000141ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141AD 10716 bytes
SHA-256: faffb72c2d647cc546c388b09e5c76344b8eba85cc67503240d109452f8355e7

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