Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4b600bc2f6f9621…

MALICIOUS

PDF

76.1 KB Created: 2021-03-06 11:50:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 9c78881e90c7a9c7017df6d2edb8fb57 SHA-1: 00edfd556371654478100034e81a68cf11679e88 SHA-256: e4b600bc2f6f96218f94d8f73a0c27e2ab09496865bb0330e0692a47ce5af13f
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, characteristic of a link farm or SEO scam. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware sites. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to facilitate malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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://nipisod.ru/aws?utm_term=the+tempest+act+1+short+summary PDF link annotation
    • http://motivawka.online/the_happy_farmer_schumann933fu.pdfIn PDF document text
    • https://lufigukinuma.weebly.com/uploads/1/3/2/6/132680864/petegazirudi.pdfIn PDF document text
    • https://mepanomelisegil.weebly.com/uploads/1/3/4/8/134899905/9762140.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386606/normal_600bab9789333.pdfIn PDF document text
    • https://jovigazever.weebly.com/uploads/1/3/1/6/131637362/e541fe39f262.pdfIn PDF document text
    • https://wefogazasu.weebly.com/uploads/1/3/4/8/134880183/089061fcd2.pdfIn PDF document text
    • http://train-home.ru/handwriting_practice_worksheet_printable19wuo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443354/normal_603fbf1a0c40d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369656/normal_60183028928a7.pdfIn PDF document text
    • https://viwitilabepimep.weebly.com/uploads/1/3/2/6/132695477/446d80fc083.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
    • https://uploads.strikinglycdn.com/files/e13274e3-2bd6-4382-8b3a-15671275ff2a/41916994097.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef13c51d-d422-423e-92f7-8b9413534d90/624596406.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9bb0d55-bd28-41b3-b367-62c1fcab0289/how_much_does_a_rheem_hot_water_heater_cost.pdfIn PDF document text
    • https://s3.amazonaws.com/poguvelefa/nejizazesogumog.pdfIn PDF document text
    • https://s3.amazonaws.com/bofake/93040592278.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a88ba7e-77eb-4131-85f1-e53ff9ede7f1/33884340960.pdfIn PDF document text
    • https://s3.amazonaws.com/zategafozasiru/98021946113.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6aa7ec60-3a95-48d2-ad85-4e6b1f5a9e6f/fifty_shades_of_grey_tamil_dubbed_movie_download_in_isaimini.pdfIn PDF document text
    • https://s3.amazonaws.com/xonaxevetaf/28828947438.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9225665e-c087-4010-88e4-1a12186487d5/material_de_lectura_para_primer_grado.pdfIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/assetto_corsa_pc_full_version.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4e1c61f-3d18-4077-9812-68c18a479f47/icom_756_pro_ii_manual.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_off0000e101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE101 4972 bytes
SHA-256: dcc50834abbeadb9b92ddadfebf8e2bc90b2b5e8b6ddd45c6767b027b6cd9b67
font_01_sfnt_off0000f1ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EE 10528 bytes
SHA-256: 68062595fdbfbbf9535ffa147bd8cf9557a96646f266a2666b539881ac0529f3
font_02_sfnt_off000114d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D7 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e