Malicious PDF — malware analysis report

Static analysis result for SHA-256 d96944c95b25a8f6…

MALICIOUS

PDF

42.9 KB Created: 2020-11-06 18:38:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 299f71b6d640eb7c16edd5c1392c2ed9 SHA-1: e6aa80274430843a94459b30ea757415dfdab0d8 SHA-256: d96944c95b25a8f6a76ba384762e0540c852383d3e78f8cb54505a73358a26cb
76 Risk Score

Malware Insights

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

The PDF document contains a lure related to an academic worksheet, which is a common phishing tactic. It embeds a URL that is flagged as a redirector, likely leading to a malicious site for further exploitation. The ML classifier strongly indicates maliciousness, and the PDF structure itself contains suspicious elements.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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://traffnew.ru/aws?keyword=impulse+and+momentum+worksheet+answer+key PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/amoxicilina_suspensao_bula.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73f48d9a-b147-4962-a55a-54aa9822a92e/wematurifevabode.pdfIn PDF document text
    • https://s3.amazonaws.com/dumupa/how_to_get_buffed_in_weight_lifting_sim_2.pdfIn PDF document text
    • https://s3.amazonaws.com/xenavuxa/genetics_and_molecular_biology_of_entomopathogenic_fungi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e00a1a4-6305-4baf-9a67-bd607e180964/najatupewadijoseruwir.pdfIn PDF document text
    • https://s3.amazonaws.com/lumixi/punctuation_worksheets_grade_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9f7dcfe-336f-4f1f-b2a4-1418b8b2556b/3697807704.pdfIn PDF document text
    • https://s3.amazonaws.com/remoxi/xabutuzuxi.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwawibu/sony_cyber-shot_dsc-h300_instruction_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42e33a30-e31b-4ca5-b795-dfefd4cc65bd/46790526381.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17138178-dc68-4288-8ce9-a1205950ac7c/3354549384.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f410f0e-b878-43d7-b098-69e04c8d8b1f/degatejogupuwaxulixewu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7baf2ffb-92b5-4d69-a952-e53321fe25b9/kumeraxaseboneleranedu.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_off00006aa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AA2 5392 bytes
SHA-256: 8c3ce38cbed7057266a22ee66afed53ac769235a8674d2242d232aa9599aaa82
font_01_sfnt_off00007cdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7CDB 9832 bytes
SHA-256: cde713a95ef88102a3175a83765c1cdc7a3cc2944f88bb4663d155f036061c5f