Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee70ddb0195d03c4…

MALICIOUS

PDF

71.1 KB Created: 2021-02-24 01:35:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 662b0df6d4a11bc02f31b9d241621b6d SHA-1: aad3e22b793596a14586c3059875c338da885f42 SHA-256: ee70ddb0195d03c4af4b3161b4d7f5635b92b36398354b7f014111ed46d14841
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 0.9998

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://crophysi.ru/strik?utm_term=autocad+viewer+online+autodesk PDF link annotation
    • https://samaruwopag.weebly.com/uploads/1/3/0/7/130738554/fe7bf4655b.pdfIn PDF document text
    • https://cdn.sqhk.co/fagaxirupunu/dhgWheF/baxebavupokenoze.pdfIn PDF document text
    • http://apparently-home.com/terraria_new_worlds_download9855o.pdfIn PDF document text
    • http://lexanizisujufum.66ghz.com/43247265013.pdfIn PDF document text
    • https://pebabole.weebly.com/uploads/1/3/4/6/134698512/6137220.pdfIn PDF document text
    • https://cdn.sqhk.co/xedasuzefer/KbdZzgi/gotub.pdfIn PDF document text
    • https://cdn.sqhk.co/timadupak/8gGhhjf/vr_theatre_video_player_vive.pdfIn PDF document text
    • https://cdn.sqhk.co/masunidupag/fhaijha/general_tso_chicken_meatball_recipe.pdfIn PDF document text
    • https://zutizogemene.weebly.com/uploads/1/3/5/3/135348028/8042307.pdfIn PDF document text
    • http://new-leggins.site/bdp_s3700_review94cqz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://topajikof.epizy.com/leadership_skills_test_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/bededuxotulapil/fantasy_general_2_guide.pdfIn PDF document text
    • http://kalotiwinilobiw.epizy.com/vedefefira.pdfIn PDF document text
    • https://s3.amazonaws.com/figugipopar/college_algebra_problems_with_solutions_and_answers.pdfIn PDF document text
    • http://zekumom.epizy.com/potential_transformer.pdfIn PDF document text
    • https://s3.amazonaws.com/zodererezuzuxi/android_tv_aplikace_hbo_go.pdfIn PDF document text
    • http://sudurima.rf.gd/candida_albicans_oral_tratamiento.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_off0000d3f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F3 5136 bytes
SHA-256: 8b03fa13bc64fc9ebb1fe07bd03155974149d58d7e2dcfc247c8cf0dd2ceaeb5
font_01_sfnt_off0000e58d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58D 12648 bytes
SHA-256: 4892568bad0306d218777edb2dffe2dccc18ecb98b5142478880bc17e772433f

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