Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ef4d21c6081f9c8…

MALICIOUS

PDF

67.7 KB Created: 2020-12-18 12:32:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: a437d59a21bcd6e6ce7891e91939beb9 SHA-1: 6d54cf3a3bc6b306fc0be384672ea09ac16b6639 SHA-256: 9ef4d21c6081f9c8d90747f431201d8821ef4890e0f2041fc0e52b5ee0801b3e
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links to known malicious redirector infrastructure, specifically `https://traffmen.ru/123?utm_term=el+calendario+azteca+worksheet+answers`. Heuristics indicate a malicious redirector and a link farm, suggesting the document's primary purpose is to drive traffic to malicious sites. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, but the embedded links are sufficient to indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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/123?utm_term=el+calendario+azteca+worksheet+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4452374/normal_5fc1045163b9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421782/normal_5fbb21b2c1662.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403413/normal_5fca6e460453a.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/wowabaxisefidet-nikuvajekibesim-napoxalapa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501046/normal_5fb2689770d5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420589/normal_5fdb0e2d4898b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365525/normal_5fc074fbb49be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386347/normal_5f934867b8f86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391903/normal_5fb5b14c58fb9.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/f1e827d6-6819-4980-840e-2097b67df8aa/94202873723.pdfIn PDF document text
    • https://s3.amazonaws.com/muwomapotumugi/car_race_movie_in_tamil.pdfIn PDF document text
    • https://s3.amazonaws.com/vazisi/kufupiparawa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e7c459e-7579-4e9d-8bfd-d86ee1e82fa4/nugudakim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e1533eb-c03d-4220-a2d3-586a41599ab1/vorimabojuzuwil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c39b260c-8d89-4120-bebf-2b542925cf91/zosetezetevixobofoxeduso.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
stream_004_off0000d27b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xD27B 9652 bytes
SHA-256: 4f55f331235f7b9b5695d58898c72571d853b05db04687543ae5abddd98e2bd6
font_00_sfnt_off0000c189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC189 4980 bytes
SHA-256: 136160134f62c722cb522f234e4bf614888df47951065eb0b21c65c3ae589ef6
font_02_sfnt_off0000f387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF387 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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