Malicious PDF — malware analysis report

Static analysis result for SHA-256 5efbf770f381bb4b…

MALICIOUS

PDF

88.2 KB Created: 2021-03-14 16:03:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 05d7db9616107a1930b51f98dabb40f2 SHA-1: c41957c1db79df2aeb1f5ee859b450dae350b736 SHA-256: 5efbf770f381bb4b251e71ad5c95caae67f077a0571b85417c1a2aea4203010c
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a lure related to 'Is peloton good for seniors' which redirects to a URL that appears to be an SEO redirector for a PDF download. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure and external links suggest a phishing or download lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/strik?utm_term=is+peloton+good+for+seniors PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421207/normal_604cb0ffcca4e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469378/normal_5ffe969e096c0.pdfIn PDF document text
    • http://cookwellbakewell.com/81568704134e2mp1.pdfIn PDF document text
    • http://msertis.xyz/what_are_the_conventions_of_thriller_genrecdtls.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450631/normal_5fdd78661f1bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404969/normal_6011e290d27f9.pdfIn PDF document text
    • http://lbaranaydin.com/28483434668a4t9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471514/normal_603c6b866e024.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465250/normal_6005ba4e8a1f3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ac65beef-1c88-4b01-a948-251493ed82f2.filesusr.com/ugd/09857b_7b11c1cb6c544258a005fc937e8dac2d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/temujonuwu/1487063189.pdfIn PDF document text
    • https://s3.amazonaws.com/nufidibodudulad/8576480611.pdfIn PDF document text
    • https://s3.amazonaws.com/lososimap/cartoon_dinosaur_coloring_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/wizuluworafid/lamoxofodugo.pdfIn PDF document text
    • https://s3.amazonaws.com/kavifunaruvi/chudi_jo_khanke_new_version_ringtone.pdfIn PDF document text
    • https://s3.amazonaws.com/zukogi/how_do_you_write_a_literature_review_for_a_research_paper.pdfIn PDF document text
    • https://s3.amazonaws.com/vukusa/sufibozabonikefilugapa.pdfIn PDF document text
    • https://c183b790-cb34-49aa-848e-1a9f2b14dda3.filesusr.com/ugd/d8966e_cf17feca05a74d5c89333798b927dda6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/guvovigo/13732318235.pdfIn PDF document text
    • https://68420551-d949-41c4-975b-2ae86aa6d062.filesusr.com/ugd/09c3c7_f9af433db5204cdf9ab3c3d54a57b77c.pdf?index=trueIn 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_off00011cdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDF 4936 bytes
SHA-256: 7829286206d652c9edd491715e823d78830e6a72522a257a5c1022466a1fc1a5
font_01_sfnt_off00012dbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DBB 11156 bytes
SHA-256: 24e28a740a92ed8a12fb3739a29f4e5fc7002074189e02881a212799f3835b96

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