Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b5e1cfd6e3f16d8…

MALICIOUS

PDF

73.2 KB Created: 2021-03-25 23:15:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 1aeb2fb5a107f499470bd9c33e0c6311 SHA-1: 6dcddbf0a5b91510c2dc9b69e9e9317a653c88da SHA-256: 1b5e1cfd6e3f16d8133b35715094cc291b4e2010ed3c040604210bb946704859
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 of which are hosted on disposable domains and appear to be part of a link farm. The primary malicious URL identified, 'https://maypoin.ru/123?utm_term=unduh+happymod+apkpure', suggests a lure for downloading applications, potentially malicious ones. The ClamAV detection and ML classifier flagging further support its malicious nature, indicating it's likely a phishing or trojan distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://maypoin.ru/123?utm_term=unduh+happymod+apkpure PDF link annotation
    • https://cdn.sqhk.co/tefozakozup/biihe4v/atif_aslam_new_song_2019_audio_download.pdfIn PDF document text
    • https://cdn.sqhk.co/sileluzorupo/gfzifha/color_of_night_full_movie_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/kawinojos/0ghpiec/toy_blast_game_review.pdfIn PDF document text
    • http://vavoferidedodif.66ghz.com/imagery_worksheet_grade_6.pdfIn PDF document text
    • http://besemafobekilir.22web.org/pulmonary_fibrosis_exacerbation_guidelines.pdfIn PDF document text
    • https://cdn.sqhk.co/kasuvapexal/aidjaie/types_of_debate_motions.pdfIn PDF document text
    • http://vuwulaviwu.iblogger.org/zirusexo.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/67fa9bdb-d50c-4dba-a8e4-f7a9cbe06260/how_to_make_jello_in_a_bundt_pan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1835031-761f-4695-910a-4b7f6f13b527/lenerofuzasizavoboza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1c5a438-a506-47ec-ba9f-9bd6676e0de9/betelatuwud.pdfIn PDF document text
    • https://c809e8a6-5bdf-489d-8d8c-df4e4638a115.filesusr.com/ugd/45a296_3eb10e8461e341e196e8bdc3372f5572.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4c0f192-08e1-4ad0-8fdb-b9fd8ca9c74b/newest_edition_of_blacks_law_dictionary.pdfIn PDF document text
    • http://xizilagitakov.epizy.com/ffxiv_baelsar_s_wall_tank_guide.pdfIn PDF document text
    • https://6e37e838-c278-4d46-baa9-25b8497af200.filesusr.com/ugd/fbcb80_5f48eb2156474a53948329b9162a1c96.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rimejiguvif/graphing_quadratic_functions_practice_problems.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a99ad7b-a00f-4d72-9e13-e173be860aaa/60990203191.pdfIn PDF document text
    • https://s3.amazonaws.com/buponuwebi/it_jobs_salary_in_south_africa.pdfIn PDF document text
    • http://jasebusezazov.rf.gd/6783812957.pdfIn PDF document text
    • https://56ca36fb-2ffa-469e-bb5e-3595d175fd87.filesusr.com/ugd/cacfd7_69bc60c3e19c4d9e9951643efaaca8cd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcc799df-36d5-4083-a3d4-56a2630ce71c/conversion_tazas_a_gramos_azucar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cec05c5-05fc-46e3-9969-882c62f67907/17076280366.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d0b1909-9ba4-4302-803c-59f2c6ac595d/97018288774.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1935c48c-c1cd-4af2-81a6-29438bae7821/movosubawufapejulalolurad.pdfIn PDF document text
    • https://101c3d73-5e22-4da1-a203-a3a2a794ce88.filesusr.com/ugd/69a512_b9008781fd874525a0898fe96b46c378.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lomuper/javascript_convert_file_to_blob.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_off0000e155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE155 5148 bytes
SHA-256: c17721339fecbb6f376ef0d1e88d287aa329979b16caf8dd2b925bf855beb03d
font_01_sfnt_off0000f2b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B4 10776 bytes
SHA-256: be84520cc4990b336979e0399f36dd8fa67e854bb89b189651ed1505fc974a4f