Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca9694935c9840b2…

MALICIOUS

PDF

75.7 KB Created: 2021-02-26 08:30:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a85b96427154ad17e56b9f10d88bfe63 SHA-1: c45f9e2871d96420149a0f4bab632a306405d75a SHA-256: ca9694935c9840b285464f7de9c97e030f4d2d36a954fcd9cf67888c8e6b9727
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which point to SEO-optimized PDF files, suggesting a link farm or phishing operation. The primary lure appears to be a link to 'The bane chronicles book 1 read online', which redirects through 'jacksth.ru' to a potentially malicious resource. The ML classifier strongly indicates maliciousness, and the PDF structure with numerous external links aligns with techniques used for distributing malware or conducting phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://jacksth.ru/strik?utm_term=the+bane+chronicles+book+1+read+online PDF link annotation
    • http://ifeelgood.club/61053081248e16ck.pdfIn PDF document text
    • http://parrrtner.xyz/babibitag1pc8t.pdfIn PDF document text
    • http://smallita.space/modern_calligraphy_alphabet_capital_letters3fq58.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403141/normal_5ff543912d85f.pdfIn PDF document text
    • http://vpntop.info/ge_telephone_answering_machinejywv4.pdfIn PDF document text
    • http://moreprodukti.com/736636742585n02j.pdfIn PDF document text
    • https://lovaxases.weebly.com/uploads/1/3/4/6/134685664/zetul_zovojara.pdfIn PDF document text
    • http://lozhobelir.space/sample_questionnaire_for_market_researchqegd8.pdfIn PDF document text
    • https://jedawakebikota.weebly.com/uploads/1/3/4/7/134715316/5224256.pdfIn PDF document text
    • https://wusulanapezuvu.weebly.com/uploads/1/3/4/3/134325740/3f8f11d1144b5de.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/fidobakipivogit/89200985410.pdfIn PDF document text
    • https://s3.amazonaws.com/jasadavebaga/siwilutekoxomumu.pdfIn PDF document text
    • https://s3.amazonaws.com/jijari/4095844189.pdfIn PDF document text
    • https://s3.amazonaws.com/daraniwekamidir/zibatemito.pdfIn PDF document text
    • https://s3.amazonaws.com/jadudusujuje/wedge_heels_brown_platform.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_off0000ed23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED23 5232 bytes
SHA-256: c4ebcb11ea0d24ca4bac897574fd9ef09794dfe117e25c80175c54b27e06b256
font_01_sfnt_off0000fee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE2 10252 bytes
SHA-256: ecd1392fb98395b8590932706461aa751e2701eda538a6fc265df7f97190d638

Open this report in the interactive analyzer, or submit your own file for analysis.