Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6d927a081afd4c5…

MALICIOUS

PDF

81.7 KB Created: 2021-05-30 08:00:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 00362c63d8b8df3e515df14403a83f23 SHA-1: d717c2322519381d151c95dfdf9f2591ab3d127f SHA-256: b6d927a081afd4c5f32c247296740a9fe094d9aa538eb628dc8116611b77d7fb
244 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to disposable hosting services and redirector infrastructure. The primary malicious link identified is https://yafferge.ru/strik?utm_term=essentials+of+business+analytics+2nd+pdf, which is flagged as malicious. The document's structure and numerous outbound links suggest it is designed to lead users to potentially harmful websites, likely for phishing or malware distribution.

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 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.
  • 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://yafferge.ru/strik?utm_term=essentials+of+business+analytics+2nd+pdf In PDF document text
    • https://wevoforu.weebly.com/uploads/1/3/4/5/134591306/2b31aa.pdfIn PDF document text
    • https://paparudedolenod.weebly.com/uploads/1/3/4/6/134686514/3102854.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401985/normal_6000f40f1d29f.pdfIn PDF document text
    • https://putesoborufo.weebly.com/uploads/1/3/0/8/130814126/puwukolinidewif-rexepokanonerov-disuko-govajawew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422147/normal_60488b9b90aa9.pdfIn PDF document text
    • https://sodipojemip.weebly.com/uploads/1/3/5/3/135325099/4369010b91387.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415740/normal_5ff13f17a932a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427793/normal_5fe252905885f.pdfIn PDF document text
    • https://lugafowak.weebly.com/uploads/1/3/4/6/134647172/3adaadb1497a1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473947/normal_5fdd69c3abd0e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385427/normal_5fc69235a468e.pdfIn PDF document text
    • https://mufuxavezefajox.weebly.com/uploads/1/3/4/4/134497947/zoxazezaridaze.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/4eb2dd01-5a5d-43fd-bbd1-be62e4dfc1fa/its_all_over_mate_lyrics_three_days_grace.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49db7d29-30d1-4711-ac29-c16c9371b8f8/evenflo_car_seat_newborn_insert_when_to_remove.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63170b4b-87ab-4438-9ba0-bad6701e1d5a/4544941958.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6b9eb7e-55c4-4d7d-989b-1d4aec4b546e/23237800036.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/575e24da-a0dd-46a1-be26-18951e188c02/6089258546.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_off0000f36d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36D 5384 bytes
SHA-256: 6ffdb03ffbd11be00138d212b2b8b58ad8a647e5c833e4673a1dc0337b28ad88
font_01_sfnt_off000105d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D6 3120 bytes
SHA-256: c9b5c4904a063eda2fd006e21c0d11b7d9e09ba17605c18bcc17455d537c1e8f
font_02_sfnt_off0001125c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1125C 11460 bytes
SHA-256: 08d831079bb81591fb5f50636aab1db8a8b13b67a92ad0b491ec4daa3c5a5106