Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec0b4c848ed4c4b1…

MALICIOUS

PDF

81.1 KB Created: 2021-03-22 06:46:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: c89f3101b921fd7a75be638bef255756 SHA-1: c615ba01a094236075746d0931de7d5de4db8ace SHA-256: ec0b4c848ed4c4b1b8cde08d97cb73f4a0edfd0272bb75db58dd76875c9ee9eb
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity, likely leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 6

  • 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 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=capricorn+new+moon+jan+2021 PDF link annotation
    • https://cdn.sqhk.co/sevalaturi/sibgfhi/killer_bean_unleashed_hack_version_download.pdfIn PDF document text
    • https://cdn.sqhk.co/tuvameboroke/jdwSOgE/the_gift_johnny_cash_review.pdfIn PDF document text
    • https://cdn.sqhk.co/piwuzuberaze/fSjbhbT/fuel_station_finder_uk.pdfIn PDF document text
    • https://liwifaxuje.weebly.com/uploads/1/3/0/8/130874244/b187d20e499.pdfIn PDF document text
    • https://molujeridinu.weebly.com/uploads/1/3/4/4/134400438/d103a4.pdfIn PDF document text
    • https://cdn.sqhk.co/zoxowowi/iiiJJUe/90481306162.pdfIn PDF document text
    • https://jazekidifa.weebly.com/uploads/1/3/4/5/134597150/gozopuviwijulumom.pdfIn PDF document text
    • https://cdn.sqhk.co/fegukajebaj/jjvje6H/wbtv_charlotte_nc.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/e3804c10-5bb8-422d-8403-fccada526b8a/redozuxifaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed3d4ab9-d3bb-4619-86a0-f37ce828463f/harry_potter_illustrated_3_book_set.pdfIn PDF document text
    • https://58552d80-c20c-4e4f-99b9-91bedbcc07a3.filesusr.com/ugd/c18496_ebb241ed6ba34c8eb566abce5fe4773b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1721992-1395-4f94-b3cf-bd9f1251a70d/wezuvefuxax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/236c2e07-6c17-4766-b703-ea427837bf7b/road_construction_terminology_dictionary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0004443-ac55-4835-9b4d-bf64047bd31c/mojunirodani.pdfIn PDF document text
    • https://2cfcb734-ec62-4cd9-b61c-03d4762ad765.filesusr.com/ugd/a891c0_264fa7c2b6eb445595276ae4ad30e974.pdf?index=trueIn PDF document text
    • https://ecf1b359-4982-44d9-836f-7e6f5fec4aa1.filesusr.com/ugd/da15c8_275bf5e871914ae98449ce13ff1a4896.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rimejiguvif/partnership_by_estoppel_occurs_when.pdfIn PDF document text
    • https://s3.amazonaws.com/levumoduf/spread_spectrum_lans.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5968ddee-f392-4351-af4d-2ba7c049bcdb/tidefexatager.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/47556896984.pdfIn PDF document text
    • https://550dfcec-0280-4316-a0d5-68b74a7a20b9.filesusr.com/ugd/f59309_7c3b8945de3448e39228ffc8c8f3c892.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/917be888-382b-481e-aac1-03bb77cdd603/how_to_forgive_unforgivable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b7851d2-fa0b-4fba-92b5-cf86ea4e2a42/21035132598.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72c295a3-f645-417b-ab9e-413d01a445bf/what_to_bring_onboard_a_ship.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5cb9e3f-c7a6-4d85-b4ec-dfa289dea0e2/why_does_my_plug_in_doorbell_not_work.pdfIn PDF document text
    • https://s3.amazonaws.com/moduxanakuri/ti_game_army_lu_cho_android.pdfIn PDF document text
    • https://s3.amazonaws.com/lolijexejomak/dobaxonevo.pdfIn PDF document text
    • https://d0a6b1b1-1773-4622-8b5e-0ab5990a7ed3.filesusr.com/ugd/b90ba1_15d6e1cb42c9401999ba1fd46efe31dc.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_off0000fec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC1 5268 bytes
SHA-256: 44a5d8c8689144e908e914d90f2575b07e2872d99def067b089cacf389dbad75
font_01_sfnt_off000110ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AE 11024 bytes
SHA-256: fee87d0f442edf8e21c99e77f7857244f3aba2733557ecb651bc20f806634008