Malicious PDF — malware analysis report

Static analysis result for SHA-256 a65ca4db74a12470…

MALICIOUS

PDF

36.0 KB Created: 2020-11-06 14:32:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 83077caa3f2a17b90f61440ab9784074 SHA-1: 91726a4e619e27eb3e109540c22ae1ad9f4703dc SHA-256: a65ca4db74a124700e37a942b4ab651c6e10e246c0d58f3a1278262403232009
134 Risk Score

Malware Insights

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

The PDF file contains embedded links that redirect to a known malicious domain, identified by heuristics as a redirector for SEO-based phishing. The document body, though heavily obfuscated, contains references to the redirector URL and other benign-looking PDF files, suggesting a lure to download further content. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/aws?keyword=bestine+solvent+and+thinner+sds+sheet In PDF document text
    • https://finiluxexolije.weebly.com/uploads/1/3/1/8/131856594/wakitafirumo.pdfIn PDF document text
    • https://gutugifowofe.weebly.com/uploads/1/3/1/6/131606479/siwof-podogajeji.pdfIn PDF document text
    • https://bazademirijef.weebly.com/uploads/1/3/4/4/134464354/lifak_rebowobudi_bejim.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://uploads.strikinglycdn.com/files/b9b1b515-71df-4959-a6d0-6901abc4889e/51031201585.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b275129-445a-4fcf-b2f1-3fa7a6dfafd2/rosario_a_maria_rosa_mistica.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/538cb80d-4035-4b56-9b87-ecaa9840082c/xuxawixapuviliwi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba35f1e8-8db6-42c6-95f0-b34c88122411/68630120347.pdfIn PDF document text
    • https://s3.amazonaws.com/pusolefosex/nitutogigusokivur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/296ebfbd-80ea-480e-8bc6-a0f1668e62ee/collegiate_dictionary_merriam_webster_s_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8947/0637/files/zikadibeloka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/434d6657-287c-42e3-9bbc-c5f58332abfc/fonopolefapodomirugixu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7afb1ed-8e95-4dd8-b0e3-2ec07a70a992/umrah_ka_tariqa.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4265 4808 bytes
SHA-256: 095ac342ff48766318928584df9b09948b037d9449792dc57958db6b704de2f4
font_01_sfnt_off000052b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x52B1 10124 bytes
SHA-256: 0c33231ef7e5504eccd971d530d85a4ad695a61d896cff9b77b6b5b35a46f6fa
font_02_sfnt_off00007546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7546 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71