Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab3755775cdb7e14…

MALICIOUS

PDF

69.7 KB Created: 2021-05-29 11:36:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 55fa7523a4aff2cb6aeeca278718d451 SHA-1: 5bc28eab4d99dacdab39f9611f964cfdba5b9c14 SHA-256: ab3755775cdb7e142588e96e441e5a8177b58facdff9ca438ce23dd190ea94fc
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9991

Heuristics 5

  • 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 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://nipisod.ru/123?utm_term=hepatorenal+syndrome+guidelines+nhs PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4444864/normal_60541136e03b1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390366/normal_60014d2f14ae2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416786/normal_5fcae504c78e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488807/normal_602a382b0e173.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453336/normal_5fc9ec04286d0.pdfIn PDF document text
    • https://tetafawewaze.weebly.com/uploads/1/3/4/3/134378669/9802261.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501963/normal_5fc5a92fc68bd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463263/normal_5fce9345efbbf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369152/normal_5fd6da0f0c4d7.pdfIn PDF document text
    • https://pafudufuwod.weebly.com/uploads/1/3/4/3/134326080/lakovokugeduzo.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4413369/normal_60b0bd586fc8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380695/normal_604aab8925010.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462037/normal_6000ea694145e.pdfIn PDF document text
    • https://razolonupul.weebly.com/uploads/1/3/4/8/134888498/5e73c0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453888/normal_5ff8312424a89.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502246/normal_5fd3d2a628054.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415309/normal_6026ef15da881.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496014/normal_604eca6bc33bb.pdfIn PDF document text
    • https://rulafusojuxibaw.weebly.com/uploads/1/3/4/2/134265871/f59d0da4e2.pdfIn PDF document text
    • https://figiroxofidun.weebly.com/uploads/1/3/0/7/130740151/780265e.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/ac1439f7-57a8-4969-986c-63b1d2912321/28663816644.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76316f45-2f0e-4bb6-91a0-98b489e0b513/81756330347.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f8bfb27-fb9f-454f-9797-580ad496e767/an_prc-148_mbitr_antenna.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/219a5bd4-5169-41c1-b3cb-e7f47f6300ff/21752902184.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14125c41-cb7b-444c-885b-71a8ae0f813b/32650063428.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_off0000d359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD359 5436 bytes
SHA-256: 527d78f005a4fd634712c94c9e361f23db53a7827b01eee9ffb4edbb442a2ade
font_01_sfnt_off0000e5ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AE 10404 bytes
SHA-256: 5867d58b204c55c04d34d72bbce5f6c45d8181ff2973d6ed7ccdc6cb9b81e916

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