Malicious PDF — malware analysis report

Static analysis result for SHA-256 f885e6cb57d7f3e8…

MALICIOUS

PDF

69.2 KB Created: 2021-02-28 19:11:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 7d5d737b44170a8d56120a5445338323 SHA-1: e97c9bd9a031439888151640618d578ad9e10ebf SHA-256: f885e6cb57d7f3e8280410ea34f595b9366bc54085041a0a13eb98cb36d49431
254 Risk Score

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/award?keyword=ocr+a+level+chemistry+specimen+paper+2 In PDF document text
    • https://cdn.sqhk.co/zururodi/ejavOii/81442954778.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485301/normal_60316ef88c5fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469106/normal_5fd92a2e07114.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401976/normal_5fce932368deb.pdfIn PDF document text
    • https://xemegejimeje.weebly.com/uploads/1/3/1/6/131636808/fomepixivul_jugowume.pdfIn PDF document text
    • https://xutepokukofegik.weebly.com/uploads/1/3/5/3/135391302/e8fc29.pdfIn PDF document text
    • https://kusazejur.weebly.com/uploads/1/3/1/4/131437880/tuwad-pavobata.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374852/normal_601621a46f10c.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/luborinizu/chp_plus_income_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/bidivo/coshh_risk_assessment_template_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/lolaritemukole/karaoke_backing_tracks.pdfIn PDF document text
    • https://s3.amazonaws.com/wujanozo/xorexizemi.pdfIn PDF document text
    • https://s3.amazonaws.com/dedinavesute/antisosyal_kiilik_bozukluu.pdfIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/sativifer.pdfIn PDF document text
    • https://s3.amazonaws.com/rafiralexezol/pufedesufazisetibavej.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_off0000d15d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD15D 5492 bytes
SHA-256: bbcb90dfea01f6f07521e17ccc74fe642b53cf77a9b1b37afc5db2e27d640fda
font_01_sfnt_off0000e3ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3EE 10784 bytes
SHA-256: 42ec4890d52d559137cfdef98a9f5c0566cfe0a40ab11711519b2cfa46483c27

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