Malicious PDF — malware analysis report

Static analysis result for SHA-256 17a28fbcd8eb63c3…

MALICIOUS

PDF

94.6 KB Created: 2021-03-22 22:36:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: dd0fab72c05acee5841b3a02d72dd1f3 SHA-1: d21479d2eddc56f36708dd193d245ce0c12c167b SHA-256: 17a28fbcd8eb63c3d619aad01b480d30f779b58fbc6484796d2b60b1e3b67fda
126 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm on disposable hosting and has been flagged by ML classifiers and ClamAV as malicious. The embedded URL 'https://jumiwimov.ru/wix?keyword=composition+and+inverses+of+functions+worksheet+answers' suggests a phishing or malware distribution attempt, disguised as educational content. No scripts were extracted, but the PDF structure and URL suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://jumiwimov.ru/wix?keyword=composition+and+inverses+of+functions+worksheet+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421624/normal_604b19fe24444.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380869/normal_5feb22b24637f.pdfIn PDF document text
    • http://dusefoxabukaza.22web.org/zovozu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374022/normal_5fe2f90befadf.pdfIn PDF document text
    • http://paxomiratu.iblogger.org/58785888991.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482407/normal_600b07c308a08.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385021/normal_5ff4d19e63da1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452389/normal_5fc7fd10c0a07.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479684/normal_5fc9f09ac6947.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456376/normal_60585649da796.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://xonifovozub.epizy.com/petagixodajixesoleledo.pdfIn PDF document text
    • https://63c5840e-267c-49ed-94d3-fc9f9d8b9c0b.filesusr.com/ugd/8c5bc8_417c3cd4ff19474b9754eea637163331.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lepefi/what_is_the_renegade_song_from_tiktok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/358fd436-27b3-42b7-ad8b-25c2a5f357f7/barrons_ap_statistics_11th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/xepululejiwof/16864195890.pdfIn PDF document text
    • https://67dc9804-4028-4298-afd7-d431d2c16fe6.filesusr.com/ugd/559c84_69dca1425fd54190a28629740f220db2.pdf?index=trueIn PDF document text
    • https://37b1cabf-41b6-4e27-befa-0fe7335ed416.filesusr.com/ugd/9d05b5_cf8124d2f85943b7b8516e0d01a30ea4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd18ed6a-9d87-4167-847b-ca3ebfc26212/8978087182.pdfIn PDF document text
    • http://savagudalu.rf.gd/44461067533.pdfIn PDF document text
    • http://boluwibedevolu.rf.gd/how_to_put_signia_hearing_aids_in_pairing_mode.pdfIn PDF document text
    • https://21a67f6d-2aea-439f-a910-ed4feb6be009.filesusr.com/ugd/173616_3d251ae726fe4012bef0061281de2aec.pdf?index=trueIn PDF document text
    • https://21d44941-995c-48b9-956b-8145330e20d5.filesusr.com/ugd/577b75_4cc21b871c4a4309b08671bb58ba4af4.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011c9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9A 2828 bytes
SHA-256: a17885b4fd577e0298a64705d5055d2ac7c2363fd7008e9cf236b3df412a17d8
font_01_sfnt_off00012694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12694 5484 bytes
SHA-256: 5554f0c47246549345fa2c0edfb632510cc3bf8cd045f91bbd129f5134538f73
font_02_sfnt_off00013928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13928 10752 bytes
SHA-256: e42a0adfaca7bfdcb588560f738cb277c76172d8999f270196747fed93d52e81
font_03_sfnt_off00015dfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DFA 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361