Malicious PDF — malware analysis report

Static analysis result for SHA-256 ace07d6c1f2f1e97…

MALICIOUS

PDF

72.7 KB Created: 2021-02-22 19:03:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 10a954b7a8c79bbc3ecc54048b156bc6 SHA-1: d701675f7e7e7bcfb4452f6b71382cc2c7301ea1 SHA-256: ace07d6c1f2f1e97d853a30ce060fccae8a4f4df4f31af5a696f36ef9268598f
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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/wix?keyword=apk+plus+1 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4424347/normal_60326da95f5e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367277/normal_60209ea013ce5.pdfIn PDF document text
    • https://vipelunova.weebly.com/uploads/1/3/2/7/132712034/jejinolosixe.pdfIn PDF document text
    • https://vasirorikipik.weebly.com/uploads/1/3/0/7/130776585/f439f9000.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422377/normal_600f2e12589b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498971/normal_6023c1f5d3fc4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376857/normal_602a8d428a215.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375690/normal_5fcc80767ea5d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475197/normal_5fde0f2e17ab5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453902/normal_600b710d2b1f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449405/normal_602a71c55e9ed.pdfIn PDF document text
    • https://jadufebifov.weebly.com/uploads/1/3/4/6/134627690/17e0e0dd003f163.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387566/normal_5feb5a1e19ff2.pdfIn PDF document text
    • http://alifan.store/8682652001gnrh8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/genedonapubefe/59869439256.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD795 4032 bytes
SHA-256: 15ef9ed744bdca9889272a34e46afbf956511d343373d68824420f0769be196e
font_01_sfnt_off0000e53c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE53C 10360 bytes
SHA-256: 39771d1788465dcaffc4d8b499f2eb9f0b138d686af14bc98c22698dbbcf4b49
font_02_sfnt_off0001086c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086C 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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