Malicious PDF — malware analysis report

Static analysis result for SHA-256 e95d3e178e0da5e9…

MALICIOUS

PDF

75.4 KB Created: 2021-05-23 02:08:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: cb5db28afc79c32446d449b43cb3d0f4 SHA-1: 73323804994aef602d165a16e3ea8952d2a8a17d SHA-256: e95d3e178e0da5e92f6a8b8b245da1c3a95483868aba81c9173e38b591726fde
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://zajinet.ru/strik?utm_term=bully+lite+v3+apk+obb PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4370090/normal_5fc7b58c79ebd.pdfIn PDF document text
    • https://zulukewawebipu.weebly.com/uploads/1/3/4/7/134745728/botakogovaburetubiga.pdfIn PDF document text
    • https://siwusoxol.weebly.com/uploads/1/3/4/5/134584737/xijofovoroze.pdfIn PDF document text
    • https://dolojimopa.weebly.com/uploads/1/3/4/8/134887070/5990514.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482012/normal_601922740884b.pdfIn PDF document text
    • https://duzopotubesafes.weebly.com/uploads/1/3/4/8/134890215/7528793.pdfIn PDF document text
    • https://baxopaparoxiw.weebly.com/uploads/1/3/1/4/131454316/a990f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411701/normal_5fe1104ce16fa.pdfIn PDF document text
    • https://buzowupe.weebly.com/uploads/1/3/1/4/131483044/86e29d04da43a0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479226/normal_60376bf2f091f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417309/normal_605b7c698fee8.pdfIn PDF document text
    • https://mebitulipavore.weebly.com/uploads/1/3/4/3/134339985/6442878.pdfIn PDF document text
    • https://satizivuzaked.weebly.com/uploads/1/3/4/3/134383512/godololefote.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/673eeea9-0209-448b-b853-83099393dd3b/why_isnt_my_bluetooth_mouse_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18de073f-57a1-4fdb-8bdb-b157dc494602/craftsman_100_table_saw_weight.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f8a7d6a-2b5f-4a08-9d71-4f5d924345db/love_and_respect_workbook_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e36ec3b-bf81-4c48-b9b6-5b746082cbaf/20837623282.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dce6ba35-ac15-43d0-a46a-14c6fc8bf8e7/ritolufaxosuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f619ab2-14a9-4323-a97c-b044f5008d06/how_to_use_aqua_fizz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62a48446-3f73-4742-ab78-c7637a9deeb0/ancient_greek_olympic_games_interesting_facts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aacfe3f7-45d6-4d52-a993-d6a3abe7b04a/wotolomujuzakuse.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/031281b9-9b68-4367-825e-b72c6b6be668/how_to_clean_burnt_italian_coffee_maker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8674489-1779-4977-8e23-88ec21ba83fd/castle_wars_2_unblocked_games_66.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD504 5120 bytes
SHA-256: 2637c78ea688ea6b567e9213e8e8bbe51b382282c3db036c4b739d0ce1cb44d2
font_01_sfnt_off0000e697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE697 10152 bytes
SHA-256: bbebb9cfb0d00f4a2d1eab2bba27d7b77c91c41696e260032bf0f059e8dc4230
font_02_sfnt_off00010970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10970 16544 bytes
SHA-256: c64f975c7c74378765a15e192890ba001b575443647995d4109c17b56814fb1e