Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a237c7c3ad73568…

MALICIOUS

PDF

78.6 KB Created: 2021-03-17 17:02:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 7168a07baf38da6ec05beb699ef7c53b SHA-1: 685ed92087d38ca719b3cc94c16b7a408fd01ebd SHA-256: 7a237c7c3ad73568052ce255bdbee519101dd2e5c7582648aa46d54621a85f04
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier output of 0.999653. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or distribution mechanism. The presence of a 'download button' lure further supports a malicious intent to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bologen.ru/123?utm_term=battlefield+4+free++mac PDF link annotation
    • http://gepatoxax.iblogger.org/ampere_circuital_law.pdfIn PDF document text
    • http://neridipazaf.22web.org/schlage_digital_lock_review.pdfIn PDF document text
    • http://izzzaaa.space/chronicles_of_darkness_conditionsogv0j.pdfIn PDF document text
    • https://sujepofuk.weebly.com/uploads/1/3/0/7/130775011/kuwezaxuboga.pdfIn PDF document text
    • https://fazizutedo.weebly.com/uploads/1/3/4/7/134768054/nisakewikukome_vijadixomideri.pdfIn PDF document text
    • http://helpcreditscore.info/murray_push_mower_repair_manualtupl2.pdfIn PDF document text
    • http://verifedform.com/babette_s_feast_full_movie_freedhsdz.pdfIn PDF document text
    • http://nabokuwaj.iblogger.org/vegiba.pdfIn PDF document text
    • https://fofosefekilom.weebly.com/uploads/1/3/0/8/130813764/fb59a7ac9e0.pdfIn PDF document text
    • http://seritepaxuv.22web.org/97477117538.pdfIn PDF document text
    • https://bujevajixa.weebly.com/uploads/1/3/1/6/131637668/f4e3d.pdfIn PDF document text
    • https://pujuwofox.weebly.com/uploads/1/3/4/8/134882524/rikefivobo.pdfIn PDF document text
    • http://rumafelaneli.mygamesonline.org/expired_polaroid_600_film_sx_70.pdfIn PDF document text
    • http://vudifabofugejij.medianewsonline.com/the_analects_of_confucius_argues_that_leaders.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xuxerikafirin.epizy.com/73268235146.pdfIn PDF document text
    • https://77a80da1-97a3-4b40-ba11-54c6d232eb66.filesusr.com/ugd/39a0fd_1cac0c5e67c4454ba4f1dab8fd706041.pdf?index=trueIn PDF document text
    • https://ec451167-49e0-489e-a150-d7dc0ecf9264.filesusr.com/ugd/fe0276_8151a6d6bab14014890730dbee35ee90.pdf?index=trueIn PDF document text
    • http://fozugafunu.epizy.com/building_blockchain_projects_free_download.pdfIn PDF document text
    • http://zobemodorujo.rf.gd/aata_aarambam_movie_songs.pdfIn PDF document text
    • http://ludujefu.epizy.com/irrigation_engineering_by_am_michael.pdfIn PDF document text
    • http://gajutar.onlinewebshop.net/personal_swot_analysis_example.pdfIn PDF document text
    • https://72858ab8-d36f-4bc2-b208-e5ec56e76d01.filesusr.com/ugd/3a4e0e_603972efe19a4368868e50c7bda191b8.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_off0000f62d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62D 5128 bytes
SHA-256: a8b3685f05ce1d0ee0814349ed84f9cb4c3a8d868564d5b34f8b3186f5a4baae
font_01_sfnt_off0001078c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078C 11076 bytes
SHA-256: 01623a01736af55a096ac533eb37e85993d8dad346fd5e5387c40a4dfa5daf0e