Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd928ab7ee0c4f5d…

MALICIOUS

PDF

75.2 KB Created: 2021-04-03 14:17:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 3932b179d5823c3ee371f3b1e5e952aa SHA-1: 6034695d569b8dabed8367aa992c2d2fc6501fcf SHA-256: cd928ab7ee0c4f5d43e4b72d03b5684609f1796c553a017c18d24c6cd04aabd5
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further payloads. Although no scripts were extracted, the PDF structure and numerous external URLs point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://resalured.ru/award?keyword=basic+computer+mcqs+with+answers+pdf PDF link annotation
    • http://tumerasiwabuzip.22web.org/fannie_mae_self_employed_income_worksheet_2018.pdfIn PDF document text
    • http://goldalbum.ru/36_questions_to_fall_in_love_arthur_aronlcvbh.pdfIn PDF document text
    • https://kobuwudorone.weebly.com/uploads/1/3/4/6/134666959/7161614.pdfIn PDF document text
    • http://detonic-shop.website/50073531855nvrmr.pdfIn PDF document text
    • https://cdn.sqhk.co/potebuso/Cjaqsij/soxavejopazowaxegar.pdfIn PDF document text
    • https://pixasowurixes.weebly.com/uploads/1/3/4/9/134904492/4720296.pdfIn PDF document text
    • http://mjawebdesign.net/fedidolinojexapoziwebi5i6qy.pdfIn PDF document text
    • https://cdn.sqhk.co/pulijidapis/Figgin0/vetazi.pdfIn PDF document text
    • https://tatabakag.weebly.com/uploads/1/3/4/8/134885094/d51a9f96.pdfIn PDF document text
    • https://cdn.sqhk.co/jedelamodafa/2tharja/minecraft_education_edition_gameplay_online.pdfIn PDF document text
    • http://kasyanbeauty.com/10_x_10_grid_papert2678.pdfIn PDF document text
    • https://senorori.weebly.com/uploads/1/3/4/6/134641151/misufatibedux.pdfIn PDF document text
    • https://jagamasukibo.weebly.com/uploads/1/3/4/4/134493784/xebogota-butepixe-tesuwe-xuxawapov.pdfIn PDF document text
    • https://cdn.sqhk.co/dodazija/gjktfjf/71470991120.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xumizimewimapa.epizy.com/daily_express_crusader_crossword_answers.pdfIn PDF document text
    • https://ad843f61-c544-48d7-8cfb-3c048b9edb46.filesusr.com/ugd/0dd9ed_28a433132b0c46b986bba6f21c246758.pdf?index=trueIn PDF document text
    • https://e97408dc-4b05-4e3b-9f19-f4127feb49ef.filesusr.com/ugd/a42eed_56be2b5671d14bb8b5529e9fbb36dd1d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zedilegol/sharp_xe-a207b_bedienungsanleitung_deutsch.pdfIn PDF document text
    • https://s3.amazonaws.com/pesetufavo/potential_transformer_circuit_diagram.pdfIn PDF document text
    • https://s3.amazonaws.com/zozofufulolig/video_call_app_google.pdfIn PDF document text
    • http://xutirekivob.rf.gd/17810886457.pdfIn PDF document text
    • https://s3.amazonaws.com/tigewibejageju/switzerland_tourist_map.pdfIn PDF document text
    • https://s3.amazonaws.com/nutanigonu/duvovawoxi.pdfIn PDF document text
    • http://pujixedigegogup.epizy.com/android_phone_cases_reviews.pdfIn PDF document text
    • https://44eeb0f0-4dc9-4d8b-b3fd-cc7ace98e90e.filesusr.com/ugd/a083a1_03a006f7d58648108b3bfb8e36d81a94.pdf?index=trueIn 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_off0000e709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE709 5628 bytes
SHA-256: 196d4fad227bcf1051316b508e3b7b9747cdebf2dff582f9b0500a9dcdee7dcc
font_01_sfnt_off0000fa16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA16 10864 bytes
SHA-256: 3d5a84cb0682b963c070c5dbca0cbd1f03a76216d31d0f14d508a9627e29faba