Malicious PDF — malware analysis report

Static analysis result for SHA-256 77227403cb44a7e7…

MALICIOUS

PDF

75.3 KB Created: 2021-03-24 00:07:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 6cdb8b6a5431d24ef4839ed953197f4a SHA-1: 2740197d2aa810e3224cb2bbf743885fc47f08bf SHA-256: 77227403cb44a7e7bdadfee63d41cfd4f50c8bbf98053896d6733b87df7b7f65
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The presence of embedded URLs and the overall structure strongly suggest this document is part of a phishing campaign, likely using a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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 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://jottigo.ru/strik?utm_term=angle+math+worksheets+grade+4 PDF link annotation
    • http://mestikon.online/campark_upgrade_wifi_bluetooth_wildlife_camera_20mp_1296p_trail_cameraslgqh.pdfIn PDF document text
    • http://busumewum.22web.org/mayspies_labels_template.pdfIn PDF document text
    • http://bilkan.fun/magic_rampage_secret_areas_1-_2wzibb.pdfIn PDF document text
    • http://idealicait.website/zurewaduvvur9w.pdfIn PDF document text
    • https://weralafopibobal.weebly.com/uploads/1/3/4/3/134338927/69b4c.pdfIn PDF document text
    • http://legrand-spb.ru/android_service_bindservice_examplebccw6.pdfIn PDF document text
    • https://xubebivox.weebly.com/uploads/1/3/5/3/135392957/d4fb113a.pdfIn PDF document text
    • https://bakedimilero.weebly.com/uploads/1/3/4/6/134609665/wumeruv-gizev-numupofif.pdfIn PDF document text
    • https://sivajusirev.weebly.com/uploads/1/3/0/8/130814673/0dd8b204804.pdfIn PDF document text
    • http://xusagetozo.iblogger.org/depexugixilatejipigo.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/13829463-6f69-4799-9af3-3427a65e5395/21946977965.pdfIn PDF document text
    • https://s3.amazonaws.com/towakog/2004_ford_focus_alternator_fuse.pdfIn PDF document text
    • http://jukatuvofijeriw.rf.gd/moxaneditekixapares.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05763200-bc9e-475f-8884-5aebb14e63c4/kuvujaxo.pdfIn PDF document text
    • http://zizowuwekizusim.epizy.com/mokuzidegakokedumuvufebi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5be6af73-da08-4e5c-9d46-ab22e42b3fc3/my_pioneer_radio_says_memory_full.pdfIn PDF document text
    • https://c064424b-11a8-4e39-a524-24a74bcd733d.filesusr.com/ugd/54e393_3cb7c4142cf44ae7833eb08d441e3606.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zijivevip/former_bendel_state.pdfIn PDF document text
    • https://s3.amazonaws.com/vonutavekip/factual_text_report.pdfIn PDF document text
    • http://gurevetafajes.epizy.com/cg_movie_website_list.pdfIn PDF document text
    • https://3c3713de-992c-4571-92b4-00afcb8cb2c1.filesusr.com/ugd/9dbdb2_5cc56d3bb5a74c7c8cd38f168ec3b6d5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/50986a28-56af-45ee-971f-df3d868ad9f2/lupeperesutogavukizavarub.pdfIn PDF document text
    • https://e60c805d-b9e1-47fc-b045-983511e9ac1f.filesusr.com/ugd/116bb2_a54271d64ce84bcaae1077c1b1f6ac51.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fa02fb6-f563-473c-b3fb-6431acdb70c8/how_to_eat_fried_worms_age_appropriate.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_off0000e824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE824 5472 bytes
SHA-256: 94c6d06893436e84fdf92a8d10c2ab08f0858f099f956d7b7bfd6e9be3fcc477
font_01_sfnt_off0000faa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA8 10816 bytes
SHA-256: 97c99dbdf95ed5fce3047b2abd259c56d1633a1f89debb2481a7fd64d5e18479