Malicious PDF — malware analysis report

Static analysis result for SHA-256 597277a0684a9445…

MALICIOUS

PDF

75.3 KB Created: 2021-03-18 09:06:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: cf85890dfdd4149445e22c07dd72197d SHA-1: 0835a88b8a5f41b40d0f7de1c3834ac527a5059f SHA-256: 597277a0684a944511e8e7e7e09f3487e5688ae81f12e5a94a4dcf6e9ac02431
196 Risk Score

Malware Insights

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

This PDF document is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. The document body, though heavily obfuscated, contains text related to setting up a Spectrum remote, likely a lure. The primary malicious indicator is the embedded URL leading to a link farm, which is designed to redirect users to numerous other PDF files, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/strik?utm_term=how+to+set+up+spectrum+remote+to+cable+box PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4470553/normal_602953e16e6d6.pdfIn PDF document text
    • https://cdn.sqhk.co/lemusezilaz/OjdigYc/banozideroxowaxuler.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451044/normal_5fec22952565e.pdfIn PDF document text
    • https://gilurabad.weebly.com/uploads/1/3/0/7/130775641/c2ccba3eaa615d6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485440/normal_5ff585c56dd69.pdfIn PDF document text
    • https://nawiveburejofi.weebly.com/uploads/1/3/1/3/131381882/fujobuxidilajul.pdfIn PDF document text
    • https://cdn.sqhk.co/nabolokewido/bribjhg/tanatotipivi.pdfIn PDF document text
    • https://wawenefawopi.weebly.com/uploads/1/3/4/4/134494228/4313098.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471692/normal_603951c395e03.pdfIn PDF document text
    • https://cdn.sqhk.co/xoresarib/fieMzgg/buzzfeed_top_viral_videos_of_all_time.pdfIn PDF document text
    • https://sojetupeduxagi.weebly.com/uploads/1/3/1/8/131856567/witexefememiwif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475562/normal_604332402c9c3.pdfIn PDF document text
    • https://cdn.sqhk.co/zabitokepum/UiaifGO/kifaxavisukotas.pdfIn PDF document text
    • https://cdn.sqhk.co/wotirixa/ZgfEEYi/amazon_music_app_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497638/normal_5fdff3f94573b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417643/normal_601936217ea66.pdfIn PDF document text
    • https://berapozi.weebly.com/uploads/1/3/0/7/130776213/mewepezik.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/gajabedafot/69970091491.pdfIn PDF document text
    • https://s3.amazonaws.com/wozoxub/tyre_industry_india_report.pdfIn PDF document text
    • https://s3.amazonaws.com/zafijukopa/augustine_writings_timeline.pdfIn PDF document text
    • https://s3.amazonaws.com/vekodupiwarobi/eastern_airlines_flight_401_ntsb_report.pdfIn PDF document text
    • https://s3.amazonaws.com/genedonapubefe/83768870745.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_off0000e98d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98D 5340 bytes
SHA-256: f1c7a7c9c40a0dd43da8c326589b3ba97ead1b57dc3c8d7152e2c2b643b6c724
font_01_sfnt_off0000fbae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAE 10548 bytes
SHA-256: a53be89174b997f39a9cf28fa2b52eecad4378001d76b985d092694f2f14534a