Malicious PDF — malware analysis report

Static analysis result for SHA-256 d03856f9605c23b4…

MALICIOUS

PDF

72.9 KB Created: 2021-03-18 09:48:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 3df97a98db2748b4bf9729caf9ba8d6c SHA-1: 584be8a7e5479f1377020bcc7f2b9027d19a3225 SHA-256: d03856f9605c23b4c0c4d8e0d14b1bd3f6beb91cf0b7379a768b9e1d366bb2c9
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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.
  • 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://soxebez.ru/wix?keyword=grey+cloud+elementary+staff PDF link annotation
    • https://cdn.sqhk.co/bapuwanuvadi/Z8sfiih/age_of_empires_ottoman_strategy.pdfIn PDF document text
    • https://javetepamez.weebly.com/uploads/1/3/0/8/130814931/bukajirovesog_jobusafozatama_gadifofe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486775/normal_604b272431eff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413966/normal_603908f357df0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465938/normal_603f53e553eb1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413467/normal_602b35e222161.pdfIn PDF document text
    • https://nedotumawu.weebly.com/uploads/1/3/4/6/134626041/tapabejagupun_debafagozik.pdfIn PDF document text
    • https://cdn.sqhk.co/zuronenom/jWnNqT8/filipino_fishing_boat_sunk_by_chinese.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rajokawaxes.rf.gd/wink_eye_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdd752b4-5d02-414b-88f7-b7a9463531b8/im_losing_it_meaning_funny.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5772fa9-0be6-46f6-b256-237a30deb925/dnd_5e_warlock_hexblade.pdfIn PDF document text
    • http://vobubexix.epizy.com/tobuli.pdfIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/merge_excel_workbooks_in_one_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/wikurixobelu/gituladifodasedarizabap.pdfIn PDF document text
    • https://s3.amazonaws.com/kozibowisenatu/latest_avg_antivirus_for_windows_7.pdfIn PDF document text
    • http://koxosam.rf.gd/google_docs_merge.pdfIn PDF document text
    • https://s3.amazonaws.com/sewamos/lg_true_balance_top_load_washer_filter_location.pdfIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/was_the_wine_mentioned_in_the_bible_fermented.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCD 5300 bytes
SHA-256: 58cb2d3e398e333e186abfdab89c91446e5e26168e40668e872a2337b7d105cc
font_01_sfnt_off0000efc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC8 11456 bytes
SHA-256: 05ac1f711c239401c1bce84e295f89cac0d2ca771fae7d979bd95589636e1d12

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