Malicious PDF — malware analysis report

Static analysis result for SHA-256 f90b32f37a994933…

MALICIOUS

PDF

77.4 KB Created: 2021-03-11 12:05:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ae02105d927b744894b24b53c14e0661 SHA-1: 9952d376d684763c80e9234df938316e65d15f40 SHA-256: f90b32f37a99493310b33e660c8128d0e2091405439909e0133e2adf9638d391
176 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a link farm with numerous external URLs, including one pointing to a PDF file, suggests an attempt to redirect users to potentially harmful content or engage in SEO manipulation. While no scripts were extracted, the PDF structure and heuristic firings strongly suggest a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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/123?utm_term=airserver+connect+android PDF link annotation
    • http://goproits.com/totogivawanematoyq40b.pdfIn PDF document text
    • http://medway24.com/algebraic_geometry_and_arithmetic_curves3vm10.pdfIn PDF document text
    • https://cdn.sqhk.co/dodiniwotud/mxMQhbT/maze_runner_characters_named_after.pdfIn PDF document text
    • http://lezeninimi.medianewsonline.com/japadokoxapi.pdfIn PDF document text
    • http://dadivasim.sportsontheweb.net/90569579006.pdfIn PDF document text
    • https://cdn.sqhk.co/bemememu/ifvieib/moksha_hinduism_ks3.pdfIn PDF document text
    • https://cdn.sqhk.co/zobelekivix/sSgfidB/vozopavagamamolafive.pdfIn PDF document text
    • https://cdn.sqhk.co/baxoladipezu/XhhgdWL/54674420859.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/betefowubevat/gds_reservation_format.pdfIn PDF document text
    • https://9d76d0c6-5807-43ac-a2ba-7b4112d1a20a.filesusr.com/ugd/5cd33b_43d0c80b83eb4887a0ce73f5386cf3e9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zomuzigo/42729616326.pdfIn PDF document text
    • https://s3.amazonaws.com/figidireki/jeronomiromopupe.pdfIn PDF document text
    • https://51da6a7d-ee05-4a49-87ee-1b74af3aeb07.filesusr.com/ugd/b80405_4c00ae93ed98448bbfa05a67b1354154.pdf?index=trueIn PDF document text
    • https://7ef7ebf0-bcb0-4ca2-8538-5a19c3e9f01c.filesusr.com/ugd/aff7ca_8593f50742e44e00b509e900b592be25.pdf?index=trueIn PDF document text
    • http://kitilogokufalu.atwebpages.com/emotional_guidance_scale_esther_hicks.pdfIn PDF document text
    • https://s3.amazonaws.com/jotizifime/37142167982.pdfIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/majestic_gas_fireplace_repair.pdfIn PDF document text
    • https://8eb0ff2f-1b5f-41fb-a82b-bf279dc7f43e.filesusr.com/ugd/868f76_882e6aedd7a0476a8d4c19aff259f719.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/que_dias_es_feriado_en_diciembre_2020.pdfIn PDF document text
    • https://14319df0-7947-4f0d-bbb3-eaa17d5eb23e.filesusr.com/ugd/c45f38_4ae2583ab85744139941a0fa800ed6fb.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B0 4740 bytes
SHA-256: 8f9c8ee0efa98c9fcf291584220e6f235264fea330ac9c7c5666588ce0a1828e
font_01_sfnt_off0000f4cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CB 11320 bytes
SHA-256: 80ff9cb3a9897de300a98a66d03da539cbd1727df46f650189324bcd6cc48415
font_02_sfnt_off00011aa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA0 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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