Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b712743b85185bd…

MALICIOUS

PDF

59.3 KB Created: 2020-11-11 23:51:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: d79dc42c780c8bbb5e434e7d6043192c SHA-1: ba6773b284d9596e28739594980b52e5d5025fa8 SHA-256: 5b712743b85185bdf0b9b0c93d99d792696b171f4f0386d7948f5bc10cc650b3
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains strings related to Halloween and potentially adult content, suggesting a lure for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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=halloween+costume+porn In PDF document text
    • https://cdn-cms.f-static.net/uploads/4445882/normal_5fa77d01c052e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366978/normal_5fac3fb95baf2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382614/normal_5fab2f276eda1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374368/normal_5f8e7f71a99ee.pdfIn PDF document text
    • https://tizupokewa.weebly.com/uploads/1/3/4/0/134013062/2626781.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386073/normal_5f9a7a50cafec.pdfIn PDF document text
    • https://ririrufazerox.weebly.com/uploads/1/3/4/5/134501654/3f6ee0971.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371003/normal_5f8952bf1297f.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/a161f807-7676-4736-b98e-6b91c7265ec1/zisarixopaporiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bc234b9-e74c-4d87-a525-8318c4a0fe0d/70246069353.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45ce7364-e6bc-4f96-8a10-df0445523ed6/22mm_watch_band_samsung.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d131d418-a707-46d3-9b72-ed7cb1ce0b9f/72583202379.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 8

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

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ade8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADE8 5132 bytes
SHA-256: 122f3aaf397037af57bb914ba7f28532f1cab6d7d477c0b4444a2db9ad9b8816
font_01_sfnt_off0000bf53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF53 9748 bytes
SHA-256: 305b8159c9b495148a9ca8d363c2335b2b8918480320b42c629dc40892551ac0

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