Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b3d6157cdb66036…

MALICIOUS

PDF

105.9 KB Created: 2021-03-07 18:27:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 8ed9bb4f16a89816e9462c62f5361d89 SHA-1: 38014c53a8dda2db5830896701726f1812b92327 SHA-256: 5b3d6157cdb660368a2ab992fb76e7d5f4fea1fcdd4441d4f18c6cbc919e0171
194 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 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://bologen.ru/strik?utm_term=usul+al+fiqh+pdf+in+urdu PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4410004/normal_60311d99942d8.pdfIn PDF document text
    • http://memokepudag.iblogger.org/esl_recipe_worksheets.pdfIn PDF document text
    • https://betisokoredig.weebly.com/uploads/1/3/4/5/134505727/8151183.pdfIn PDF document text
    • https://bugebapujeze.weebly.com/uploads/1/3/1/6/131606260/dedokuv.pdfIn PDF document text
    • https://lomekizawulom.weebly.com/uploads/1/3/4/7/134704223/0c4715ed6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370066/normal_601992572cbd3.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bupijila/invoice_template_odoo.pdfIn PDF document text
    • https://4095172d-bd2f-4181-91d7-dd424e653400.filesusr.com/ugd/df73ab_7f72048c7a004420adbe8b65e5134852.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4b296f4-d9dd-4ba2-9a81-5e29a2b20857/genie_lift_gl-8_parts_list.pdfIn PDF document text
    • https://30f21d72-2b41-4965-a7bc-2abb02bf1ded.filesusr.com/ugd/47e66e_a8ba34de97234bc4a8d6fc9b56a19173.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/90711edf-2fad-4efa-8ee0-19ffe882a23d/crossbow_plans_pattern.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78ae54b0-0d05-4e93-a95a-f431bb6d652f/89661633620.pdfIn PDF document text
    • https://a39ac558-8fe8-437d-9e10-dc9402d6cb9c.filesusr.com/ugd/1ebe14_aa47c9cc0a2341b9a56b5fd001d3e31f.pdf?index=trueIn PDF document text
    • http://dewelimu.epizy.com/fluid_catalytic_cracking_handbook.pdfIn PDF document text
    • https://52c77544-2eb8-427c-ad0e-a8a7e2ea9366.filesusr.com/ugd/93288f_6d91947c046d4e508866ddb0b43e3dd8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lokijuronig/felexuvapelaloreta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b641a1d0-70f9-479a-b871-f183cf67d184/is_the_movie_big_short_based_on_a_true_story.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40dbbd6d-c83e-435b-92a2-99d474f22405/how_to_use_the_dyson_dc50.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000122d3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x122D3 10876 bytes
SHA-256: 191fae99d937adf19b46ecd6a6105b51bc2ac90251ce02ce91019da169411186
stream_005_off00016961.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x16961 27892 bytes
SHA-256: 1b4a515e3cd5f653c6ed1b9716e36c8f3fb427149eb109021ce43ed63dcff6d2
font_00_sfnt_off00011109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11109 5244 bytes
SHA-256: 5eed377f9d057ab13cacf9a4cf50f2eb43f9580b487ff5e20e004d78f7ae777b
font_02_sfnt_off00014164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14164 12216 bytes
SHA-256: 838bed341b54ebbaa67813754aebffad93a863f39f1ed96a8d5a16b3b327218c