Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb2ffbd5f79ddb41…

MALICIOUS

PDF

77.1 KB Created: 2021-03-19 10:48:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5be5439962b4267404642fa2bfeefea7 SHA-1: 9738afacb5cc4890bffcda12aa8713f1e3d4bbd9 SHA-256: fb2ffbd5f79ddb417b7da31158a2344a23c99cdc93c344abe8ce77060b49decf
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 0.9996

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://jottigo.ru/award?keyword=adobe+reader+pdf+download+free+windows+10 PDF link annotation
    • https://cdn.sqhk.co/wesuwajil/5shfjcL/defender_90_2021_price.pdfIn PDF document text
    • http://bapulesaj.mygamesonline.org/81730373897.pdfIn PDF document text
    • http://lufusozajufa.22web.org/aphasia_exercises.pdfIn PDF document text
    • https://cdn.sqhk.co/pirujezexod/Hsiaohd/idle_arms_dealer_tycoon_mod_apk.pdfIn PDF document text
    • https://pujuwofox.weebly.com/uploads/1/3/4/8/134882524/xoges.pdfIn PDF document text
    • http://pemufosapakem.mypressonline.com/fekukefomesobolobe.pdfIn PDF document text
    • https://cdn.sqhk.co/navotezive/hahatiN/rolly_vortex_high_score.pdfIn PDF document text
    • http://tuzotumefakorok.scienceontheweb.net/applied_physics_jntu.pdfIn PDF document text
    • https://cdn.sqhk.co/sofawaju/h5jfift/gizigupeloriduwelizu.pdfIn PDF document text
    • https://cdn.sqhk.co/polopomoset/gcsahiM/win_at_merge_plants_defense_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/jibezilesu/jhyjeeC/bike_racing_games_download.pdfIn PDF document text
    • https://nerutemiwuxofa.weebly.com/uploads/1/3/1/3/131398157/4c21b9f720307.pdfIn PDF document text
    • https://cdn.sqhk.co/geroterunetu/rhdjehf/glacier_national_park_guide_map.pdfIn PDF document text
    • https://cdn.sqhk.co/xawesani/xdjkjfS/opera_in_balet_ljubljana_labodje_jezero.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sewexojin.rf.gd/muscatine_power_and_water_tv_guide.pdfIn PDF document text
    • http://leriwegozeko.epizy.com/performance_appraisal_comments_for_team_leader.pdfIn PDF document text
    • https://d8d078ea-10ec-4787-8e21-ef6e32b87a24.filesusr.com/ugd/8f6098_b36631e8463c498792a8100191445365.pdf?index=trueIn PDF document text
    • https://5fb42ee6-a9be-400a-98f2-f9d4b9f720c8.filesusr.com/ugd/1813b3_e01603b2805f42ba84860d3cfb7d2bfe.pdf?index=trueIn PDF document text
    • http://vineberute.epizy.com/zodejegidebumumonesazog.pdfIn PDF document text
    • https://fd7a53fe-11c1-4e60-83ad-ac1bb997268f.filesusr.com/ugd/5cf23b_b52e53a989ed446f93b995a1c24e880a.pdf?index=trueIn PDF document text
    • https://8cff94d3-ecab-4ea5-ad27-d3e67d02fd32.filesusr.com/ugd/2813e2_4198ab5b696447c4bb6133edce5c5d79.pdf?index=trueIn PDF document text
    • http://musarozopod.rf.gd/update_weather_report_in_kolkata.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_off0000f274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF274 5448 bytes
SHA-256: f91bda8f1a421b38fa816c37c6d094f70d368bbd8bada3df660c8782250a37b2
font_01_sfnt_off0001051b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051B 9916 bytes
SHA-256: 6bac765d82c8d916ded35c3226fde455b082bd25f5c7a6ca747af134f05a10c5

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