Malicious PDF — malware analysis report

Static analysis result for SHA-256 18a53b23ecbeae95…

MALICIOUS

PDF

76.0 KB Created: 2021-03-24 06:08:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 2adc0e062fef8e78405be557782f7b32 SHA-1: 9f4b326e7549a34ff5e8dd00c4225fb78bbbb229 SHA-256: 18a53b23ecbeae952c698bf9754b81e048a985b895e33e6b5ffbc3139530459d
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to Weebly and S3 domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. The embedded URLs and the document's structure point towards a phishing or malicious redirection scheme, likely using the document content as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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.
  • 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://seumenha.ru/award?keyword=ecological+theory+of+child+development+pdf PDF link annotation
    • https://lonofajizol.weebly.com/uploads/1/3/5/3/135389348/8271b69223f4099.pdfIn PDF document text
    • https://dirogine.weebly.com/uploads/1/3/0/7/130775503/gegunupuge.pdfIn PDF document text
    • https://wolunogejafijut.weebly.com/uploads/1/3/4/6/134649672/8389475.pdfIn PDF document text
    • https://dojebuxepoviguf.weebly.com/uploads/1/3/1/4/131407435/fupejibabenubuso.pdfIn PDF document text
    • https://fatuvubexu.weebly.com/uploads/1/3/4/4/134496757/wowefibobozifatejof.pdfIn PDF document text
    • https://zisusanizapan.weebly.com/uploads/1/3/0/7/130775047/7295200.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/e2f8923c-f9cb-4372-93c7-34baac1d630a/piriwuxudoxudodibizimuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88250b46-2e6b-4eac-a091-022b33b9fade/shadowrun_returns_etiquette.pdfIn PDF document text
    • https://s3.amazonaws.com/sogovekevi/cambiar_teclado_espaol_android.pdfIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/driver_asus_sabertooth_990fx_r2_0_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/xoguwavosuje/duwubij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ea24633-7cf7-4537-b6bd-2f4aa03d1de0/77181192773.pdfIn PDF document text
    • https://s3.amazonaws.com/woxojuxafopuv/8359478802.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/791557ed-5c14-4084-995b-d45c0deb489b/biden.pdfIn PDF document text
    • https://s3.amazonaws.com/satudifin/wutobowotijuf.pdfIn PDF document text
    • https://s3.amazonaws.com/wonumafubij/bettelheim_the_uses_of_enchantment_the_struggle_for_meaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a883191-738a-40a2-a721-24773767921c/what_should_a_4th_grader_learn_in_math.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_off0000e8de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DE 5512 bytes
SHA-256: 5be0a47df959f36dd0e5cc9725ed7e0741b525c8ac88e4246acb9a56b16c35ef
font_01_sfnt_off0000fb8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8B 11644 bytes
SHA-256: 0e917a4b42f630100f947b016aa4f5aa80352eb7f4805499654eaeb0b9d7dd16

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