Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7e39e7e5090d340…

MALICIOUS

PDF

82.9 KB Created: 2020-11-14 15:12:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 0cc77bb3218546703bfb1a9edf59be0d SHA-1: de771990d686f0775a212c85f98a0d3b4609a83f SHA-256: a7e39e7e5090d340715d2080fd71cb55b88b1ac8ad46dc52b13e8e7310b8d17a
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafftec.ru/strik?utm_term=the+royal+road+to+card+magic+epub PDF link annotation
    • https://bekefopu.weebly.com/uploads/1/3/4/6/134692172/5976161.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370791/normal_5fad3fac19b53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423431/normal_5f9a73228f6e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370764/normal_5f91348724234.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375206/normal_5fae3b028e7e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366369/normal_5f8b1c545b3da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368218/normal_5f905cf7d7692.pdfIn PDF document text
    • https://kasukironumasex.weebly.com/uploads/1/3/1/4/131454791/sewesudoz-lolanini-mewijusezewatak.pdfIn PDF document text
    • https://rabugotekinevod.weebly.com/uploads/1/3/1/8/131871666/8853281.pdfIn PDF document text
    • https://vogizezadu.weebly.com/uploads/1/3/0/8/130814341/govuwe.pdfIn PDF document text
    • https://bilewobadazape.weebly.com/uploads/1/3/2/6/132695578/zoguma.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/8554420.pdfIn PDF document text
    • https://wazuwivanesigov.weebly.com/uploads/1/3/4/4/134431766/456662a0ada873.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/46bc1dc9-a82d-4b96-b6bc-e811fcfcb451/super_fighters_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6082ebff-2f4d-4ca2-9dc2-b585c60fe198/asus_ramcache_iii_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11fc94cb-7ece-4692-a840-fb518f686d38/small_flower_pots_with_drainage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25ac6bcb-632c-4886-a253-118713c60ac6/rezeka.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00011322.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11322 18148 bytes
SHA-256: cc410e453ec67f3ae7aaf5cc2dc5a58262b9f4336aa013155f59c7e57a92d782
font_00_sfnt_off0000cbfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBFA 5276 bytes
SHA-256: 97a926239cfb3f1f9da15992824ca181bff2cc4394cdf869f562b9bb22ca253a
font_01_sfnt_off0000ddec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDEC 5200 bytes
SHA-256: 4ff498e5e34346602d4bdf7e9c81c37fbd15ffa724fb95c016b2f5f57df86d3e
font_02_sfnt_off0000eee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE9 10596 bytes
SHA-256: f4acc812800be3da6baff677a2683c0d0b2717797c03bb1d554800340f869f7d
font_04_sfnt_off00012f63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F63 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71