Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd73665507467645…

MALICIOUS

PDF

74.8 KB Created: 2021-05-13 22:40:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: e0c9eea5969a960c16c6a9d46468e63d SHA-1: 8278687e30dedf70306d4fb31468552860abf256 SHA-256: cd736655074676452b19cdd5b832fa6ded670d9d95f765878789ac2e050ab1ac
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or SEO link farm. It contains numerous external links, many pointing to disposable hosting services, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or SEO spam campaign, likely delivered as a spearphishing attachment.

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://xajibur.ru/strik?utm_term=metro+2033+redux+gameplay+review PDF link annotation
    • https://cdn.sqhk.co/segevenujuka/rXIccig/the_big_apple_crossword_clue.pdfIn PDF document text
    • https://cdn.sqhk.co/tixunadegu/dijhjb0/92861298344.pdfIn PDF document text
    • https://xipunozelizu.weebly.com/uploads/1/3/1/3/131382486/4907af048.pdfIn PDF document text
    • https://cdn.sqhk.co/nimuxugemu/vihjbhi/animal_farm_plot_summary.pdfIn PDF document text
    • https://cdn.sqhk.co/jenireni/df1zgj9/22218851370.pdfIn PDF document text
    • http://serviceforyou.site/1943300068582uw8.pdfIn PDF document text
    • https://cdn.sqhk.co/vitimosugu/dghhdzu/fall_guys_game_download_play_store.pdfIn PDF document text
    • https://cdn.sqhk.co/xolanikipiz/Lgfjavc/6ix9ine_runner_pc.pdfIn PDF document text
    • https://gusemotasejodab.weebly.com/uploads/1/3/2/7/132741535/melezo.pdfIn PDF document text
    • https://cdn.sqhk.co/bozogekeji/7ibjjgg/1st_grade_math_problems_addition_and_subtraction.pdfIn PDF document text
    • http://boevoenlp.com/wonderwall_projector_troubleshootingua08n.pdfIn PDF document text
    • https://cdn.sqhk.co/viwedanej/hahhgj6/21846025085.pdfIn PDF document text
    • https://pasezoxe.weebly.com/uploads/1/3/5/3/135347718/6213398.pdfIn PDF document text
    • https://cdn.sqhk.co/vomemubevu/b9Bvmgi/jonalevekuwuzefabejugud.pdfIn PDF document text
    • http://boomerangoo.site/fnaf_world_exe_download31unl.pdfIn PDF document text
    • https://jarofuzaduse.weebly.com/uploads/1/3/4/5/134502270/b71cc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e69cfcd5-1e1c-4417-bfeb-de262b029d33/fufakojegube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7dafddc-e6c1-4acd-a23e-c731dffd9185/how_to_use_a_coaster_brake.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5aa8ac7f-b544-4ffb-8129-757d73287e10/will_having_sex_while_pregnant_cause_bleeding.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27f168ad-b36e-4616-94c4-1f52403e341c/51976897143.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4544748f-f55f-49ea-8756-0560c0760058/what_determines_standard_enthalpy_change_of_formation_for_sodium_chloride.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_off0000e503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE503 5868 bytes
SHA-256: 9198b9a4bd04a87ad8febaec351755855fbe4dd2dd75357231fa6f413844a22f
font_01_sfnt_off0000f90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90B 10788 bytes
SHA-256: 27850942c70a410bf9df0d95167fca69df3bf9d44592674b3cbb757d2f2c1877