Malicious PDF — malware analysis report

Static analysis result for SHA-256 858e6fb1f7295eae…

MALICIOUS

PDF

78.8 KB Created: 2021-06-10 00:36:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: f67422ea265984c904ee086f3caecb6e SHA-1: 244d3fea8b37198f5f6bb265154a55513426ed1c SHA-256: 858e6fb1f7295eaead6bd5ff3f14b06edbacf77d7a48cd7ae2c3398b38533ee1
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://crysiq.ru/pbw?utm_term=a+quick+shortcut+maker PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4368481/normal_5fe5c2d4b6724.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447267/normal_602089749cb8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410016/normal_605d841da1822.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448727/normal_606c990fa0d29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450517/normal_604034a0331d5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413977/normal_5ffd01833dbec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412909/normal_6034da58504c2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375361/normal_5fc91ab08d1d3.pdfIn PDF document text
    • https://fiverepibimasi.weebly.com/uploads/1/3/4/8/134893498/numuzazulidoxa.pdfIn PDF document text
    • https://zufulakoloti.weebly.com/uploads/1/3/5/3/135301661/soritukew.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
    • http://jozeluwofe.pbworks.com/w/file/fetch/144619425/free_video_editor_that_lets_you_add_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e12f219-73b1-4205-93d7-a0f65af28cae/how_to_draw_a_girl_for_beginners_step_by_step_easy.pdfIn PDF document text
    • http://kopixikosibi.pbworks.com/w/file/fetch/144950676/pejisororimarazodetad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/002ceed4-9596-4764-8bde-17eeaa6f677a/toro_personal_pace_mower_starts_then_dies.pdfIn PDF document text
    • http://supulilofib.pbworks.com/f/style_lessons_in_clarity_and_grace_exercise_3.4_answers.pdfIn PDF document text
    • http://joraxakegeg.pbworks.com/f/the_hills_have_eyes_2_dual_audio_720p_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8a32f81-c41d-4f56-9454-c6f4bb446571/fawigusuxubak.pdfIn PDF document text
    • http://risuxujuvu.pbworks.com/f/sovalowajemewu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1ec16ea-7edf-422f-9184-7ce1d7680b79/2785409280.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61177049-c4ec-4b89-8941-7b056e86efe5/asp.net_tutorial_2020.pdfIn PDF document text
    • http://wekibivu.pbworks.com/f/where_christianity_started_in_nigeria.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_off0000e49a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49A 4964 bytes
SHA-256: 14e3c19038ed46d967b8f43b291f69771b0f547b2f528673ff82b9303cc5795e
font_01_sfnt_off0000f57b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57B 13048 bytes
SHA-256: 12e4d1a42c1f526afdd936517f679b0b8ce30ee9d6f3011e3f22464f885d85ff
font_02_sfnt_off00011e64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E64 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333