Malicious PDF — malware analysis report

Static analysis result for SHA-256 05b3c513c823cff3…

MALICIOUS

PDF

76.6 KB Created: 2020-11-16 19:20:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 4151de10dedba87ca49ea158c1641d1d SHA-1: 1650a2fd47755db5e0b84d50a765e589dc3298ac SHA-256: 05b3c513c823cff3b8fd94bf2c5f73899d316b05c08ab472019b9fc346f9c8d8
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 ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content.

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=david+cook+always+be+my+baby+mp3 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4389095/normal_5f8f5cab87a41.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368495/normal_5fab6ffbd5a4f.pdfIn PDF document text
    • https://dumitekajeru.weebly.com/uploads/1/3/0/7/130740207/f70e202.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384037/normal_5f9c2a8338c2b.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lorifumofelu/67022223481.pdfIn PDF document text
    • https://s3.amazonaws.com/vipinib/coweta_county_tax_assessor_map.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7acce19-eaf4-4596-b6b4-0997715d04a8/juluwaxin.pdfIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/manisale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e0625db-e76d-4032-9614-aa1540f1aec6/dojaker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/923909e2-d598-4cd2-9351-c1bbf6b504a7/3176870156.pdfIn PDF document text
    • https://s3.amazonaws.com/dejolavubukugeb/87137368271.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad6b4cda-740d-4b69-af8d-c279113d1809/vozegolojitivasulavex.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD7B 2848 bytes
SHA-256: c3c447f4240617886dc4559678e674cc909af03c7c2538e326264683770ee11c
font_01_sfnt_off0000c9e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E2 5744 bytes
SHA-256: e6ccf25c0cf6d69735d57b2817c9f544e70ebc1ce12286d408f8ac8051b70d9e
font_02_sfnt_off0000dd86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD86 15128 bytes
SHA-256: 36656c077ea3fd5efdcddbdaddf55d7612285a9c05ac3e0f3fcc7b2d0c5a6811
font_03_sfnt_off00010b7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7E 16936 bytes
SHA-256: 9c85035a6e4e5d47b452fd446ce2c75b1d01cd347b867e96f3d9be2404ed41d9

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