Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ff4083a976642e6…

MALICIOUS

PDF

82.3 KB Created: 2021-03-14 20:32:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: f35ff49283734b9cc34f8556b9546a06 SHA-1: 88e56d4f1958b350e390fe87f7a950534aa5318d SHA-256: 7ff4083a976642e631e47c78246f96e404473ddec99e0c9e5daee8a8cad930a7
186 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a phishing or SEO spam campaign, indicated by the presence of a large number of external links, many pointing to disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or phishing sites. No scripts were extracted, but the PDF structure itself is designed to host numerous external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://gimoguvi.ru/strik?utm_term=the+wanderer+poem+summary+pdf PDF link annotation
    • https://cdn.sqhk.co/favejofu/jfjiVj9/pubajawosejifababinawur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467581/normal_60489c4c6af36.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485329/normal_6029e87784696.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477400/normal_5ffcc45be8132.pdfIn PDF document text
    • https://feroxetisilujux.weebly.com/uploads/1/3/1/4/131409167/diwurufuxopawiw_jexuzim_roguwuwok.pdfIn PDF document text
    • https://cdn.sqhk.co/fapewejav/itZbuhd/65851080834.pdfIn PDF document text
    • https://cdn.sqhk.co/gusiloxi/cSvXtjj/20924544549.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376598/normal_5fd91c0109f14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471946/normal_6041110398fb8.pdfIn PDF document text
    • https://fikijumosoliz.weebly.com/uploads/1/3/5/4/135400707/5391394.pdfIn PDF document text
    • https://cdn.sqhk.co/vinasujitupe/4Ihhggs/sandwich_maker_grill_chicken.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376096/normal_6034fd7c94efa.pdfIn PDF document text
    • https://miwujiloj.weebly.com/uploads/1/3/4/3/134333625/fd8a018ddbf.pdfIn PDF document text
    • https://resonorur.weebly.com/uploads/1/3/4/8/134874279/dubunesiburetitalu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484618/normal_602a82c865062.pdfIn PDF document text
    • https://rixatesar.weebly.com/uploads/1/3/1/8/131871899/gogaxif_renijat_ralumupimek_piwazugilo.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/lijulijowivaze/have_to_exercises_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/fonazuzixagizir/top_20_family_feud_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/piradi/77887677745.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc3f02db-ff4a-4ce7-bfe4-ed4b9cbc65ae/war_and_peace_1966_movie_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68613b9b-5d82-46ad-97e5-5bd340f8337f/30474868507.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a22a5bb-ed53-46e5-9025-52af4805324a/77107739623.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd31f40c-b761-4220-b90f-e36e47e0dc25/where_can_i_get_free_dog_food_samples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6659f95-995b-4995-b42b-83c9c71cdee4/eventide_space_presets.pdfIn PDF document text
    • https://s3.amazonaws.com/xisakazelelinim/17138797036.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_off00010196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10196 5392 bytes
SHA-256: b89e699baa6ba1130dbaf17d59c4f843f780609f19c75463e2c48d817d2b317a
font_01_sfnt_off000113db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113DB 11660 bytes
SHA-256: 01b59c7ba83ebdd4c0dfc54d229d407cb1692a93964a24c0d3bd15e4c95c90a2