Malicious PDF — malware analysis report

Static analysis result for SHA-256 125e7897b44f882a…

MALICIOUS

PDF

109.9 KB Created: 2021-03-30 14:52:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 76c56bb5dae99af367c2f0159ba1a93a SHA-1: 92df1b325050ee02b141f19f483fe033a2013bdc SHA-256: 125e7897b44f882a37f94515ce0dc442f6db0bb32d81e53c2ee453f901210f5d
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many pointing to disposable hosting, suggesting a link farm designed to distribute malware or facilitate phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs and the heuristic firings related to PDF link farms point towards a phishing or malware distribution campaign.

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://resalured.ru/strik?utm_term=live+indian+stock+market+software+free+download PDF link annotation
    • https://cdn.sqhk.co/norumuwapa/jih9hgr/zombie_catchers_hack_unlimited_plutonium_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/baxijaxazixi/jKggYji/sky_events_tonight.pdfIn PDF document text
    • https://cdn.sqhk.co/dolavalof/CYVjbhb/haunted_run_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/fegibidizog/jaVJhir/4282538698.pdfIn PDF document text
    • http://tufowolulexa.22web.org/91250077278.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fepasike.epizy.com/rukenukipawivigik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c5280b4-22f0-437b-84e1-5761c3531b08/mokododazofazowijanafigo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5dc3e987-f9e8-4d81-9981-4dd63c43fa5e/nazm_hikmet_hayat_ksa_iiri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4aea6f5-1d52-4b8c-9d52-0c8cca0e8846/dd_personality_type_quiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d7c7ec9-c62d-4aeb-be1e-6bddc3c5631a/gatowirenanivumexol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bc960cc-ee8c-4adf-b48b-0867db833f09/how_to_start_a_fashion_magazine_business.pdfIn PDF document text
    • http://gevegure.rf.gd/57286455334.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e79ea517-6e2e-40a2-8f4b-16c2ce8a6185/25437986722.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac3d18db-bf70-4115-bd5a-d2afed8449d2/jemoranejinolezavijadisu.pdfIn PDF document text
    • http://nitusul.rf.gd/boy_scout_class_a_uniform_badge_placement.pdfIn PDF document text
    • http://sarirasa.epizy.com/antivirus_for_laptop_windows_8.pdfIn PDF document text
    • http://zesivukawavomu.rf.gd/hormonas_vegetales_auxinas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26b71fea-358e-4c2d-bc4a-e0d7d0a61598/how_to_find_monthly_dividend_stocks.pdfIn PDF document text
    • https://f7cac2f2-528f-490f-9bef-cb2448a877de.filesusr.com/ugd/529ba0_8fad467cd1ee407f97ff2357cc3d8572.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba1b30d4-408a-40aa-a97d-eab4fb0f31df/xirokedekufapusarobo.pdfIn PDF document text
    • https://67d298e0-85f4-4ad4-bf36-e1ac857e42fc.filesusr.com/ugd/b6bf5b_9bb647e4a0834a5990c63163a61e859c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0f891da-f3d3-4c00-b9b0-14879823ef14/kenmore_ultra_wash_dishwasher_not_working.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_off00016f14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F14 5324 bytes
SHA-256: 8c2f5d514fb3fe43a93e9bdf9fb1512f5e09704eb6a701d492ab553769e494ac
font_01_sfnt_off00018136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18136 12068 bytes
SHA-256: 715d3abb836d0af0582869269e840d105fa322974ed5d91255dae33d75719b73