Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5fd2a13c147bd28…

MALICIOUS

PDF

78.4 KB Created: 2021-02-22 00:04:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 6a658debe7caf2188eae2e6da5e092a0 SHA-1: b0be00101786e2a1a5e279c0f18180dce93bcd62 SHA-256: b5fd2a13c147bd28aaf3ddcbe8786c5a2929cb989fe4872c7f9cebd17e0b69fd
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many of which are part of an SEO link farm designed to redirect users to potentially malicious content. The primary lure appears to be a link to 'baarspo.ru', which is flagged as an SEO redirector. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://baarspo.ru/123?utm_term=sword+art+online+progressive+manga+vol+3 PDF link annotation
    • http://lenudes.com/19051823710jhqt2.pdfIn PDF document text
    • https://xivogere.weebly.com/uploads/1/3/0/9/130969247/1916331.pdfIn PDF document text
    • http://theharaka.online/jopumilujlnjt7.pdfIn PDF document text
    • http://aycotoro0.xyz/trivia_crack_questions_sciencev3732.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448550/normal_6018a2d6027d5.pdfIn PDF document text
    • https://tatunonomufobuf.weebly.com/uploads/1/3/4/3/134355176/sajenot_pesula_neguwem_feluvalolire.pdfIn PDF document text
    • http://rafale.store/pevuken22ye.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/faduxodiwo/asus_laptop_x453m_driver.pdfIn PDF document text
    • https://s3.amazonaws.com/vutame/camera_effects_app_free.pdfIn PDF document text
    • http://xutirekivob.rf.gd/avis_car_rental_application_form.pdfIn PDF document text
    • https://s3.amazonaws.com/nigimul/toxexurarakewud.pdfIn PDF document text
    • http://bogazukutij.rf.gd/sajonabemajiji.pdfIn PDF document text
    • https://s3.amazonaws.com/jobavo/38846346008.pdfIn PDF document text
    • https://s3.amazonaws.com/wuniku/lepukidepami.pdfIn PDF document text
    • https://s3.amazonaws.com/boxalewijim/vekibidopodogavo.pdfIn PDF document text
    • https://s3.amazonaws.com/nijudow/itsy_bitsy_crossword_answer.pdfIn PDF document text
    • https://s3.amazonaws.com/jotizifime/a_scanner_darkly_book_vs_movie.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_off0000f2e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E5 5696 bytes
SHA-256: 10000a9845afc09342aa9c4e8600d499bbf4b590c293c9142266b6ea72199356
font_01_sfnt_off00010650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10650 11636 bytes
SHA-256: c7e8c7bccd881cbaf9e854693b84c02180d3d6ed8def17911547adccb205d6ac

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