Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a1e904da8f09f9a…

MALICIOUS

PDF

76.4 KB Created: 2021-01-01 02:11:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 9a916262bea9bc5b219f67c320a68307 SHA-1: 4190f0ec75f6dc0cdcabee72482b2409585d9521 SHA-256: 2a1e904da8f09f9a92fb24d88dea80df2c0eb573d8931def9a531ade621bcdf1
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, contains text related to 'Planet earth shallow seas worksheet answers', suggesting a lure to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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.
  • 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/123?utm_term=planet+earth+shallow+seas+worksheet+answers In PDF document text
    • https://xuvarilanagore.weebly.com/uploads/1/3/4/4/134470983/9519376.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/zukogi/inlay_onlay_preparation_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e3742d0-84ec-4083-ad99-0f1a5e1b1663/8_snf_din_kltr_ve_ahlak_bilgisi_konu_anlatm_video.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33eac799-9e5c-415c-9d37-09b90b68c91b/61232915251.pdfIn PDF document text
    • https://s3.amazonaws.com/xapijifas/32501147261.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80866d8f-db38-4e40-a818-991bbc0aa6e7/harley_davidson_stencils_for_airbrushing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c9ae603-a394-40ab-b6c7-9d64a1e49842/67984002255.pdfIn PDF document text
    • https://s3.amazonaws.com/kevava/casio_g_shock_wr20bar_price_in_malaysia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2843980-56d7-4b94-8f11-05e26afa136a/barerezenivatup.pdfIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/livro_acgih_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/satulibaren/beef_jerky_dietary_information.pdfIn PDF document text
    • https://s3.amazonaws.com/wajibile/79294153739.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_off0000e38d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38D 2960 bytes
SHA-256: ba9dd86ad06677ef82b9fc66565cbe1db364e5caa8fb73f24ce3e10b7ab9a08b
font_01_sfnt_off0000ee10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE10 4928 bytes
SHA-256: 87ea6e593f1b11190dfcee4541554ff39d4a8c27604498c0497b26f15f4445c3
font_02_sfnt_off0000fedb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDB 10996 bytes
SHA-256: 5aa72e6a689bceb15ac3da14401dd9bdadc411dcd473fca87fd3984421f546bd

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