Malicious PDF — malware analysis report

Static analysis result for SHA-256 48b759ad359ecd91…

MALICIOUS

PDF

77.0 KB Created: 2021-05-23 03:08:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: c415acda2de1938efe28f0b83e77c552 SHA-1: 63f474401ffc904da5734abc429cbcf3e404a2c6 SHA-256: 48b759ad359ecd91694353e8bb8a827a15c8af0cfc9ac4a5874f4cb60f705ea6
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to disposable domains, suggesting it's part of a link farm designed to manipulate search engine results or distribute further malicious content. The primary malicious URL identified is https://baarspo.ru/strik?utm_term=the+hockey+sweater+lesson+plan.

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
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://baarspo.ru/strik?utm_term=the+hockey+sweater+lesson+plan PDF link annotation
    • https://pezebojikunebal.weebly.com/uploads/1/3/4/3/134362674/nunafawodoj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393908/normal_600921d293f97.pdfIn PDF document text
    • https://kagojidumone.weebly.com/uploads/1/3/2/7/132740327/zixiwapetigiwure.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454435/normal_5fdbe5d06aac1.pdfIn PDF document text
    • https://dodilepu.weebly.com/uploads/1/3/4/4/134444379/silizitogoxodifuluto.pdfIn PDF document text
    • https://kivepuwepadile.weebly.com/uploads/1/3/4/3/134392404/susosifakosivu.pdfIn PDF document text
    • https://tirotoperanape.weebly.com/uploads/1/3/4/3/134315774/2955014.pdfIn PDF document text
    • https://rafunipigadim.weebly.com/uploads/1/3/1/3/131380466/kuwetetajusop.pdfIn PDF document text
    • https://zeloseko.weebly.com/uploads/1/3/1/1/131163733/409509a1676c34f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417419/normal_6055b8b06594b.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/80c079b1-05e3-403e-ac38-cf17620cc571/matajefaxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c10fde1-4c08-40af-bdad-c75c40a31b5f/how_long_is_ford_warranty.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cad41f26-b221-4b30-a90b-edff41a331a1/rakalujemu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/074cb53a-7d20-4d53-9e52-d754c5bcf118/wavuminewal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/835588ca-8927-45a8-ab67-c515cdf1f3a4/1584125403.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd4bb97b-2c37-40ac-8fd1-8211b9e93abf/how_to_get_logs_animal_crossing_new_horizons.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_off0000f075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF075 5228 bytes
SHA-256: b5b7e9dae6713d20ac21b2b8a6d133db9ab59e7ab0a6a6e846b868a06d59a171
font_01_sfnt_off0001024d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024D 10724 bytes
SHA-256: c4c0c7234c411ea5648c65b9ece098265804439c391a9a5b55965e18ad1d8abd

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