Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca8165b17497b340…

MALICIOUS

PDF

89.0 KB Created: 2021-05-21 18:10:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d97a62d160f5110b8d689d3e551d1d02 SHA-1: 8a77fea1f9615e016eb00b981bdddedafe817ce6 SHA-256: ca8165b17497b3403be9ddba91117cbbc554cacdcc560e3325111c0454fd3b56
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 0.9989

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://crophysi.ru/strik?utm_term=hidruro+de+cromo+ii+nomenclatura PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4482426/normal_5fd83f310013b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409630/normal_601ce3d70fb7f.pdfIn PDF document text
    • https://dafemiperufukoz.weebly.com/uploads/1/3/1/3/131379503/6796690.pdfIn PDF document text
    • https://nogomikosisodop.weebly.com/uploads/1/3/2/6/132681488/f489a92c.pdfIn PDF document text
    • https://jivekale.weebly.com/uploads/1/3/4/3/134319103/7804052.pdfIn PDF document text
    • https://xixozikitep.weebly.com/uploads/1/3/4/0/134097223/7575306.pdfIn PDF document text
    • https://jisogixisizula.weebly.com/uploads/1/3/4/3/134328009/9d08f1b3e.pdfIn PDF document text
    • https://wonakusoxenim.weebly.com/uploads/1/3/5/3/135340368/funiwixulon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454281/normal_5fe9b74f1b8f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367952/normal_5fe74e4125eba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483345/normal_6016f9ca01fcb.pdfIn PDF document text
    • https://nevijajemiwawo.weebly.com/uploads/1/3/4/3/134340376/90ccb24.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419001/normal_604cf813e4ff4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379961/normal_600a75d8ea1c4.pdfIn PDF document text
    • https://rinavogorefun.weebly.com/uploads/1/3/4/4/134446464/4823017.pdfIn PDF document text
    • https://bijivabaj.weebly.com/uploads/1/3/4/6/134601785/78de4cc0dd1aee.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/bd2ae6e9-ae4e-44f6-a2f7-ca867bd0a738/wakeguxixoxubenizoretofo.pdfIn PDF document text
    • https://s3.amazonaws.com/fuzafuzeruwit/10354644781.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bcfa918-0c1a-4ac7-afaf-cd1de1a59913/94357935509.pdfIn PDF document text
    • https://s3.amazonaws.com/jojitagifuva/xisomovosamixired.pdfIn PDF document text
    • https://s3.amazonaws.com/fajujiju/guzebesanoloto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08e0bb77-39e1-439f-bb9a-064bafa6965b/37384522273.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8384dd47-ef79-4e05-9302-abf7d1ab1852/how_many_spell_slots_do_i_have_multiclass.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/746a0bbc-23ed-4366-be3e-8d0a3888c348/drivers_hp_p3015_windows_7_64_bits.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000110e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E1 4748 bytes
SHA-256: ef62b65583f90c97133fdb239aa5328617a346429469660358b3e640d1b6fddb
font_01_sfnt_off000120d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D2 11744 bytes
SHA-256: 254d16288d355d4cd9f172b30a24ae9bb0e0015d5c751b99108d0a9cef829898
font_02_sfnt_off000146ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146BA 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333