Malicious PDF — malware analysis report

Static analysis result for SHA-256 475fdf4c066dfe08…

MALICIOUS

PDF

240.3 KB Created: 2021-05-29 08:48:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: a7810bb6f3d3a09c1441cae3f6ab8076 SHA-1: d36ed61c0e453504fbbc84c9be98611d22875048 SHA-256: 475fdf4c066dfe08ba108c57984cc3c94adb06c5e8314c5f0d6ab63ed0f6cbad
136 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including a high-severity 'Image lure linking to an SEO redirector (free-download phishing)' and a critical ClamAV detection. The embedded URLs, such as 'https://bologen.ru/123?utm_term=apologia+general+science+worksheets', suggest a phishing or malware distribution attempt disguised as a free download. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://bologen.ru/123?utm_term=apologia+general+science+worksheets PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4382972/normal_603ffc2d81896.pdfIn PDF document text
    • https://tunupufimudodo.weebly.com/uploads/1/3/4/3/134324073/9855519.pdfIn PDF document text
    • https://rowusebejaron.weebly.com/uploads/1/3/1/6/131637242/jedeniwabuwer.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4468268/normal_60b1ad0b26c6d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402707/normal_5fce22d125b26.pdfIn PDF document text
    • https://gosasaweju.weebly.com/uploads/1/3/1/3/131384289/5827898.pdfIn PDF document text
    • https://zopivorideruv.weebly.com/uploads/1/3/3/9/133997575/eb66317fc40e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4859805/normal_605a080154799.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417815/normal_603e3cb42614d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484103/normal_600fd5a76c8e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369932/normal_6047f7990d6df.pdfIn PDF document text
    • https://zawibovime.weebly.com/uploads/1/3/2/6/132681883/09b5db85cb1.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4384143/normal_60b1b03c4230c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413968/normal_6012cd5c6bac8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491451/normal_5fc6afe841846.pdfIn PDF document text
    • https://nagenexam.weebly.com/uploads/1/3/0/7/130776307/132146.pdfIn PDF document text
    • https://xozisimoxu.weebly.com/uploads/1/3/1/1/131164350/zojokibukupotewer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473938/normal_6037606c830c3.pdfIn PDF document text
    • https://popuverixi.weebly.com/uploads/1/3/1/4/131438274/dc2a9b37c8f.pdfIn PDF document text
    • https://babejogoj.weebly.com/uploads/1/3/1/8/131856270/dijiwuf-tomemekire-fanavolusanisuw.pdfIn PDF document text
    • https://xurarasetar.weebly.com/uploads/1/3/4/0/134096945/dujediwetar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447465/normal_602231a94dd13.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_off00037b0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x37B0D 5340 bytes
SHA-256: 3039af85c66973151cd2c19684aa008d26894291a1217b5d5915b540053629ff
font_01_sfnt_off00038d48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x38D48 10920 bytes
SHA-256: 475c002ddec63ef8ad67f29f10e657590b10d5b6ee93556914b3870a2df23707