Malicious PDF — malware analysis report

Static analysis result for SHA-256 821cab763ed38ab1…

MALICIOUS

PDF

64.1 KB Created: 2020-12-24 21:05:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: bcf2b5c198b3c8eb757a2eff4f2cdc7b SHA-1: 974a082cf21ccc6e80dc324082808c4332f2d06a SHA-256: 821cab763ed38ab1c29b33e7263b47bae01d9a20fd03e4f6105c307df2815bf4
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF was flagged by multiple critical heuristics as malicious, including a redirector link and a link farm. The ML classifier also strongly indicated maliciousness. The embedded URLs suggest a phishing or SEO manipulation scheme, likely intended to lead users to malicious content or further phishing pages. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

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/aws?utm_term=best+king+size+sheets In PDF document text
    • https://cdn-cms.f-static.net/uploads/4481282/normal_5fa8af26ba82c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367005/normal_5fa5ede7dde86.pdfIn PDF document text
    • https://pinozawekik.weebly.com/uploads/1/3/4/5/134589254/9965686.pdfIn PDF document text
    • https://cdn.sqhk.co/dutebevon/fKjejjW/riwisipezunelejumireg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377912/normal_5f9475715911f.pdfIn PDF document text
    • https://cdn.sqhk.co/tonuviwa/hCig7hd/sazazijogi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370286/normal_5f89b5e4357c4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a0ee35a-fc36-4207-9194-46088f23edab/5346430438.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c496f902-1c92-4d91-b8fd-9f62255f2938/30211897169.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b20e8de3-26dc-4468-a63b-35a9c9be75f8/nudajunus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0b57279-01fa-4be0-97c9-24ffd493a06d/ttd_online_seva_tickets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06ead058-466d-4d26-9e07-9da04fe4cade/tojuvekomavir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6576e4b-b00a-47b8-b3e4-4ddbbcbe2c47/vocab_workshop_level_d_unit_4_synonyms_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69ebbe57-25d2-4907-8b41-626189994237/aluminum_hurricane_panels_lowes.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_off0000c1f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1F6 4772 bytes
SHA-256: 7881afaf54ee2ff66d743b2d09ca754416df3df7c4f4a4dd750d0e83517e7d74
font_01_sfnt_off0000d247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD247 9880 bytes
SHA-256: e617fafd175e215eb86bf71d9ee4f212a9f92a9e41550093b47c948b9d9bd78b

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