Malicious PDF — malware analysis report

Static analysis result for SHA-256 118febf7ff6f86c0…

MALICIOUS

PDF

67.0 KB Created: 2021-02-04 10:50:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 19ba12ffb4316751b9715b976825be6c SHA-1: db246987542bd496eb287229f35553425a1ddbb5 SHA-256: 118febf7ff6f86c0625a6c579ae9a524a15526004dfbb1f21b03603b895568e7
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing attempt. It contains a lure referencing an 'Intex 18 x 48 pool owners manual' and embeds a URL that acts as an SEO redirector, likely leading to a malicious payload. The presence of PDF-specific heuristics and the nature of the embedded URL strongly suggest a phishing attack leveraging a seemingly innocuous document to deliver malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://leonvi.ru/123?utm_term=intex+18+x+48+pool+owners+manual PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4462345/normal_5fffb9b54301c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422912/normal_600bccaf6cf29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410201/normal_6018bed48cbb9.pdfIn PDF document text
    • https://cdn.sqhk.co/daladovum/cjjjjjh/my_cloud_ex2_ultra_8tb_review.pdfIn PDF document text
    • https://cdn.sqhk.co/ratosakip/mLwD2hh/roferivivodolajaranexad.pdfIn PDF document text
    • https://cdn.sqhk.co/ditetona/iepgihh/air_strike_force_unblocked_games.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403679/normal_600fc72971d85.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484370/normal_5feb9c733ac0b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456377/normal_5febe78c369f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455403/normal_600f2e89496da.pdfIn PDF document text
    • https://cdn.sqhk.co/tumowara/uShfHii/mdacne_vs_curology.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451555/normal_5fc8b29946c8c.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/wozowuledij/psp_emulator_android_pro_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/mawesenasijoser/lomapa.pdfIn PDF document text
    • https://s3.amazonaws.com/nigimul/avast_antivirus_for_pc_windows_8.pdfIn PDF document text
    • https://s3.amazonaws.com/kesumasaka/vuveminidifiwukanabejaviw.pdfIn PDF document text
    • https://s3.amazonaws.com/levovod/faa_aircraft_registration_application_form.pdfIn PDF document text
    • https://s3.amazonaws.com/waxegatulo/cardiovascular_disease_guidelines_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/fenatagazise/right_triangle_trigonometry_solving_word_problems_answers.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_off0000c875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC875 5396 bytes
SHA-256: 8fdf337a333a32af0dcb411cae3d10ed0c311be5effe022eee793ec7f05c4645
font_01_sfnt_off0000dad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD7 10480 bytes
SHA-256: d4589f19373f5fff97f9f4165416a1b6995246be255925172202aba4621ef35b