Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed8169d1e090c743…

MALICIOUS

PDF

71.0 KB Created: 2020-11-18 14:59:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: af8c49299a6a1ba101dd62030de1302b SHA-1: ecda2c9769591acf3be9e3a8732307b865b605e6 SHA-256: ed8169d1e090c743fadd805ddddc4af26b981e7d3456bb47c43858f87abfb827
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of links, many pointing to potentially malicious redirectors, disguised as a download for 'Asphalt 8 highly compressed android mod'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware sites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic confirm the document's purpose as a link farm designed to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://traffmen.ru/aws?utm_term=asphalt+8+highly+compressed+android+mod In PDF document text
    • https://weniwekozeg.weebly.com/uploads/1/3/4/0/134012595/2003128.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454679/normal_5fa4e54dd44d7.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://uploads.strikinglycdn.com/files/32a3fc61-12ae-4e9e-8758-7d81dba9b75d/24873919303.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93440fc2-4be0-4c86-96d1-f5daad810e63/jasanadofodiv.pdfIn PDF document text
    • https://s3.amazonaws.com/liwafo/fupagoxabepaliwufimona.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbad0ffa-d8ff-4ee5-994e-4a920745ba54/kevumudakotarij.pdfIn PDF document text
    • https://s3.amazonaws.com/rubidokezive/91544642068.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e01ea7b4-8667-4e9c-bf3a-278e150d1916/39439513352.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c08ce353-6d77-4536-bb9c-834401e916ce/sibarebitezadakiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95d92161-3ed5-4f51-a8f6-d7f281852f47/2011_honda_accord_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3df5da08-ab17-4606-b60b-4ce4c24f3206/43400498262.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

Related samples 1

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B1 5560 bytes
SHA-256: 3f3ae14c78d7ba6d91dd0e5770b87048d02be3ee2f7f269653c989771fec2792
font_01_sfnt_off0000db64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB64 11080 bytes
SHA-256: 66ab37d18a957fc6600c7ed9c6fcbff35c0a35f0060caf6482788b34bbdcea96
font_02_sfnt_off00010101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10101 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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