Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5454c0852a05c4c…

MALICIOUS

PDF

72.5 KB Created: 2021-02-23 01:52:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: b65d4878d75922dfed1d0c4070327f58 SHA-1: 67b8c7ecd77a29d177ac77643c8d6e434f82ff94 SHA-256: c5454c0852a05c4c25a95c81256d7f1bf94108a1f952eeb1fed02221190253cd
186 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://crophysi.ru/123?utm_term=how+to+apply+cast+member+discount+on+shopdisney PDF link annotation
    • https://cdn.sqhk.co/puvubuzu/gdHIWja/elements_of_design_space.pdfIn PDF document text
    • https://cdn.sqhk.co/gikokimofegi/e2NooWE/nepajusamebakev.pdfIn PDF document text
    • https://cdn.sqhk.co/ragojagef/idzCf0d/cthuloide_welten_archiv.pdfIn PDF document text
    • https://folarudivol.weebly.com/uploads/1/3/1/8/131871739/sawoxad.pdfIn PDF document text
    • https://cdn.sqhk.co/daposofoxig/hbVeljd/lisabusosidusekavugog.pdfIn PDF document text
    • http://zibalada.iblogger.org/9585906836.pdfIn PDF document text
    • https://cdn.sqhk.co/suvotoruwot/hhghifB/free_download_warship_battle_movie.pdfIn PDF document text
    • https://fomoxizukewoviw.weebly.com/uploads/1/3/0/7/130739072/5f7e7.pdfIn PDF document text
    • https://cdn.sqhk.co/xopigotax/1jiKjjj/4_pics_1_word_3_letters_green_man.pdfIn PDF document text
    • https://cdn.sqhk.co/zudilubal/fqQjijc/free_computer_courses_for_seniors_brisbane.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/wutogugej/47887087240.pdfIn PDF document text
    • http://mapureju.epizy.com/metformin_overdose_lactic_acidosis.pdfIn PDF document text
    • http://rapaxaj.rf.gd/48000763280.pdfIn PDF document text
    • http://zumuwojik.rf.gd/bluestacks_app_player_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/fedojigudaj/mazda_6_android_auto_upgrade.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_off0000db0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0E 5608 bytes
SHA-256: f07f127783bd873e7d87f8562d21d1ba8534d1c5840f63e20062bb2d69815867
font_01_sfnt_off0000edfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFD 11680 bytes
SHA-256: 41b8e9f500a3323f6f52f38bf7a0b208b0986be0164e92182acba4ba5dffe5b7

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