Malicious PDF — malware analysis report

Static analysis result for SHA-256 155ca476ec7cc3ac…

MALICIOUS

PDF

71.1 KB Created: 2021-02-16 20:14:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 3f5cbbd03996d721d090ac1fd0b0ec47 SHA-1: b0f2121affbebd7e1b275f6c8984625995d66613 SHA-256: 155ca476ec7cc3aca66c81fb956a072fa27b003cd5e08f06f9c0fe3915bb956a
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains heuristics indicating it is a phishing lure, utilizing an SEO redirector to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing campaign designed to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://druttle.ru/strik?utm_term=2+nephi+32+commentary PDF link annotation
    • http://liketime.online/mac_android_studio_gradle_permission_deniedhypn4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485016/normal_6012b2b652f14.pdfIn PDF document text
    • https://jekowidemovo.weebly.com/uploads/1/3/4/7/134702183/kanekal.pdfIn PDF document text
    • https://cdn.sqhk.co/fopeziriga/igptha2/sherlock_tv_series_wallpapers.pdfIn PDF document text
    • http://yourcy.com/18804049496idsae.pdfIn PDF document text
    • https://fometixivoros.weebly.com/uploads/1/3/1/6/131637143/5eb6ac8dc3d64.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481667/normal_6004bed3e5dda.pdfIn PDF document text
    • http://vvvvvvvvvvvvvvvvvvvvvb.xyz/envision_florida_algebra_2_teaching_resourcesk4swu.pdfIn PDF document text
    • http://de-bewertung-889562.icu/poisson_probability_distribution_examples_and_solutionsyef40.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463808/normal_5ff7c86e4fb41.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403807/normal_5ffd64c07ac5e.pdfIn PDF document text
    • https://vemekejafor.weebly.com/uploads/1/3/4/0/134012611/bujeweveji.pdfIn PDF document text
    • http://groshyk.site/formal_allegations_legal_definitionk1dqv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371240/normal_5fc761194409e.pdfIn PDF document text
    • https://rafopovuweke.weebly.com/uploads/1/3/2/7/132740485/3639082.pdfIn PDF document text
    • https://cdn.sqhk.co/letijefa/njfCidq/u_mobile_prepaid_minimum_top_up.pdfIn PDF document text
    • https://zuwodavipufowaf.weebly.com/uploads/1/3/1/4/131408056/wofimamodojisetimela.pdfIn PDF document text
    • https://zatiwakap.weebly.com/uploads/1/3/1/8/131871625/volobetumijos.pdfIn PDF document text
    • https://cdn.sqhk.co/puvegipuros/dofcgiG/jolegiteb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d7fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FB 5268 bytes
SHA-256: 171f9e27d7eca31901c152c64ee3afd2262c00ae611cefb8b5a4e6ff63a150fe
font_01_sfnt_off0000e9c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C4 10548 bytes
SHA-256: 1f00bc8c506844af245630418caf28d0d5ff0aae28a2c5e3ce16ae0daff16d6d

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