Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d783cc108569f88…

MALICIOUS

PDF

75.1 KB Created: 2021-04-02 14:36:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 80dbd4b43439f7bf163943cb995248cd SHA-1: 5534f842bd0626d8b5ef99cdced58fde87639dc0 SHA-256: 2d783cc108569f88ca760f49f1b2c013cd02bf8ed5b8129034fd0ea1b053701a
126 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which point to disposable hosting services, indicating a link farm or SEO spam campaign. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the presence of numerous external URLs suggests an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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://jottigo.ru/strik?utm_term=how+to+pair+nakamichi+earbuds PDF link annotation
    • https://cdn.sqhk.co/remimidotomi/dgifYjd/faily_brakes_2.pdfIn PDF document text
    • https://mipapipav.weebly.com/uploads/1/3/4/0/134012398/de9a7d921f.pdfIn PDF document text
    • https://cdn.sqhk.co/kevovevude/8jcifCC/bubble_breaker_online_kostenlos_spielen.pdfIn PDF document text
    • https://wubenigulusetib.weebly.com/uploads/1/3/4/7/134712949/lumetezamalej.pdfIn PDF document text
    • https://lifezudo.weebly.com/uploads/1/3/0/7/130739479/bajazonaromime.pdfIn PDF document text
    • https://cdn.sqhk.co/pagozixupezi/jijshcX/piano_tiles_with_anime_music.pdfIn PDF document text
    • https://vazatevetag.weebly.com/uploads/1/3/0/8/130874289/6860360.pdfIn PDF document text
    • https://xemegejimeje.weebly.com/uploads/1/3/1/6/131636808/wukifivimekafaponoxi.pdfIn PDF document text
    • https://dipapira.weebly.com/uploads/1/3/4/6/134610741/6149613952.pdfIn PDF document text
    • https://cdn.sqhk.co/lebereme/ijihxhb/baledejiwuf.pdfIn PDF document text
    • https://cdn.sqhk.co/nefakovuwot/hibieia/last_hope_zombie_war_3d_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/boguzivipel/xgQhjja/resident_evil_8_village.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/b34ce8a8-7062-4fc0-bbed-58dbd231bca5/tc_helicon_harmony_singer_manual_espaol.pdfIn PDF document text
    • https://s3.amazonaws.com/xefezesebusu/noir_chronicles_city_of_crime_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fb77100-3368-4d0b-b22d-4def7ccddf6a/download_xbox_360_controller_for_windows_7_32_bit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2da94946-3d35-4271-aaa1-b29fca7ea386/daily_language_review_grade_6_worksheets_free.pdfIn PDF document text
    • https://s3.amazonaws.com/votawawo/business_administration_thesis_topics.pdfIn PDF document text
    • https://s3.amazonaws.com/suxugipipolazog/rofiw.pdfIn PDF document text
    • https://s3.amazonaws.com/legenapi/6142216988.pdfIn PDF document text
    • https://s3.amazonaws.com/boxalewijim/basic_welding_skills_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40da51e2-a841-4da9-beca-6cd47f277315/88317935228.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/000ba720-12ce-4a30-b5d9-b995ac6946c1/dell_latitude_e7450_i7-5600u_test.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_off0000dcd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD1 2880 bytes
SHA-256: b90b109c34db9b2d961be312c0c64f13ba4f5af9c83d6ae4556a72cb7f468167
font_01_sfnt_off0000e70f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70F 5536 bytes
SHA-256: a0fe2d102ea2f6760e1a8935934fce4f26e5182b05350b4b54a72841f97c82e9
font_02_sfnt_off0000f9c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C1 10888 bytes
SHA-256: c706941fc5c87238c5dce1af20f9a51121214038b8e61a2f7557a5dc2bbf4169