Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad1e097c372eb960…

MALICIOUS

PDF

80.4 KB Created: 2021-03-14 09:44:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 00981aab2e70cfe109a495a7190de5fc SHA-1: d89f05f24eb5c4ff9fe07551bea9f9db98cefaa8 SHA-256: ad1e097c372eb9607b70f86b092a0f60c6d9ed8afc27337471c771a5313f0559
192 Risk Score

Malware Insights

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

The PDF contains a link disguised as a download for a knitting machine manual, which redirects to the malicious URL 'https://dafemum.ru/strik?utm_term=brother+knitting+machine+kh+260'. This URL is flagged as a known malicious redirector. The presence of this malicious link, combined with heuristics indicating a link farm and a phishing/trojan detection by ClamAV, strongly suggests a phishing attack aimed at redirecting users to malicious content.

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
  • 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dafemum.ru/strik?utm_term=brother+knitting+machine+kh+260 In PDF document text
    • https://cdn.sqhk.co/tovitaxani/2gCmjar/90355329427.pdfIn PDF document text
    • https://cdn.sqhk.co/libewepigux/djacsgg/domesedubeveletubabola.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/farowug/zero_hours_contract_template_2019.pdfIn PDF document text
    • https://ba10d46a-d7c1-43af-8542-f1a50f31aa8a.filesusr.com/ugd/4dded2_2e662ace1895444a89cd9bd7ae82f202.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a835851a-c835-4a35-9483-e8b0c5183c50/tokyo_ghoul_re_op_1_roblox_id.pdfIn PDF document text
    • https://s3.amazonaws.com/fupanabivote/what_is_instagram_community_guidelines.pdfIn PDF document text
    • https://e5baaea7-7007-41de-9367-4ebf3ed55875.filesusr.com/ugd/8e1900_938ff75cb56f4debab09e7dfa1b97034.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jinabisura/canon_750d_manual_focus.pdfIn PDF document text
    • https://2d2b1dae-c014-4902-97e6-c3f1d56915cd.filesusr.com/ugd/70e5f7_2e3e66f168884692b573caeaadb4c83a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c23ed38-36a6-4d61-9494-9ae0dd1f7306/digital_marketing_course_online_free_with_certificate.pdfIn PDF document text
    • http://wororezijetixa.atwebpages.com/69770456067.pdfIn PDF document text
    • https://8ed7b8cb-9bae-4def-ad9b-66b28cd11f91.filesusr.com/ugd/740d8c_51253acfe22c4f89838273217b4f4368.pdf?index=trueIn PDF document text
    • http://gixiluvigatekij.atwebpages.com/life_and_death_in_one_breath_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/457d77bb-4de0-4377-81e2-ad75e492da29/delta_36_725t2_table_saw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68b6207f-ed06-41c4-a945-6f94945ab349/fuzefonidikofeju.pdfIn PDF document text
    • https://57eba762-b826-4879-8d7a-7f480aba2934.filesusr.com/ugd/e89c2b_0a38d4d512be4400a4df191a1c19a022.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/04f22a7d-e134-4a5e-a98a-3774fd91fd3c/sharp_lc52le835u_aquos_quattron_52_3d_1080p_tv.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_off0000fe11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE11 5544 bytes
SHA-256: 95ee78185f8f32e7d37057ac865fbe4740be7f1b711ba90b7c377d1f45294891
font_01_sfnt_off000110c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C5 10568 bytes
SHA-256: bd6d9933c1359387ed47f062f275b36674b986487a678260bf978e661798f6aa