Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ebce0c85e14a2c6…

MALICIOUS

PDF

79.2 KB Created: 2021-04-03 12:52:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 01355405515787914975021a95900dbf SHA-1: a6c7d421bebfe520dd5d3b02104b97518811595b SHA-256: 5ebce0c85e14a2c6fb07ca02d6ef4491beaf607d55b034cb6655b99124b077cf
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a significant number of external links, indicating it functions as a link farm. While no scripts were directly extracted, the PDF structure and link farm behavior suggest an attempt to redirect users to potentially malicious sites or for SEO abuse.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://topsale.pro/underworld_blood_wars_in_hindi_filmyzilla.comuzk5u.pdf In PDF document text
    • http://brandframeb.com/goberejizenogurizasrod0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426945/normal_6021d44ec0702.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486344/normal_6000a8c52ae17.pdfIn PDF document text
    • http://aov.one/planche_de_radiesthsie_gratuitecuene.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379485/normal_5ffd3690394f7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454421/normal_5ff2c569de1dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405440/normal_600fb9c47d21f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470681/normal_5ffadc6c44e9e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421615/normal_603b4389dda76.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418175/normal_605720c57e84b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/dRGGkpkNhSI/wb?keyword=christmas%20fake%20book%20pdf%20bbPDF link annotation
    • https://uploads.strikinglycdn.com/files/95c6a5d3-da9a-4e9b-b143-8d7b515f4db1/wildgame_innovations_mirage_review.pdfIn PDF document text
    • https://441768bb-9839-4df4-8f78-dd1233b527f6.filesusr.com/ugd/7e6080_d6982693062d4f8da28ccf17d00a1bcb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae4e34b2-4daa-4907-94da-76a05929b907/56759396660.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0b17888-4474-41bb-b120-b33b71b02ce8/brown_v._board_of_ed_definition.pdfIn PDF document text
    • https://9579f988-9383-433c-acf3-5fff76e0c882.filesusr.com/ugd/191a6d_50ae17f395e144c29ac1b3f04fdcba90.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb1a83d5-8ab5-4470-bb68-d16945087de1/is_siemens_plc_software_free.pdfIn PDF document text
    • https://9e1b5e4e-b4ab-405b-8fdf-b3b6d7b19c28.filesusr.com/ugd/94ea38_205ddaa4cc5349d1ac43d68ebb18ac0d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4267829-c4e4-4306-b644-f8caa66a7ad3/where_to_use_pointers.pdfIn PDF document text
    • https://84d51d8d-5932-465a-b044-5d36dace581c.filesusr.com/ugd/98e2de_19154510826a4272900d25b77a879ac8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ffb249d-5707-448f-86a1-446becef888a/15583487897.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3036ca6-bdb9-48c5-af3f-e4e286da4f3f/parking_near_fire_and_ice_boston_ma.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05334d8c-31f0-418b-ad5d-705807cf836a/english_lesson_speaking_activities.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_off0000e9ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AC 5156 bytes
SHA-256: 914aa7f5e5a4921739ae62f93fd1e56c17ecd1e6c9294f56ce76ad856281e484
font_01_sfnt_off0000fb28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB28 10772 bytes
SHA-256: 5ba758c2ecec70906b92409d02822cffd6c05968fe1d53a40f4eb2c58c947435
font_02_sfnt_off00011fcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FCB 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333