Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3d2e963062094a1…

MALICIOUS

PDF

81.9 KB Created: 2021-03-14 06:56:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 18de36883e10ed91646dd2546f40102e SHA-1: be596587862c24c1872e4282397fdb8fda9eaa5b SHA-256: d3d2e963062094a1e8a6bf9916b962cc5434a7e9e8f0b067ec4c9e79c2d24656
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 hosted on disposable domains, indicative of a link farm. ClamAV and ML classifiers identified this as malicious, specifically a phishing trojan. The embedded URLs suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://leonvi.ru/123?utm_term=whistleblower+complaint+pdf+copy PDF link annotation
    • http://insurancecarusa.com/hp_deskjet_3052a_inknzkzw.pdfIn PDF document text
    • https://cdn.sqhk.co/rewakevutel/c8gjjiE/tomando_definition_in_english.pdfIn PDF document text
    • http://pojorabe.iblogger.org/how_many_carbs_does_panda_express_fried_rice_have.pdfIn PDF document text
    • https://serataxufo.weebly.com/uploads/1/3/1/6/131606193/jimuzebe_betuxijib_lewagiriverido.pdfIn PDF document text
    • https://cdn.sqhk.co/mumoragato/S6gFhiJ/tiktok_songs_playlist_download_mp3.pdfIn PDF document text
    • https://valodoxajub.weebly.com/uploads/1/3/4/4/134435871/butijewanupugo.pdfIn PDF document text
    • http://blog-uniswap.org/tovujepexazvtefo.pdfIn PDF document text
    • https://vekatofe.weebly.com/uploads/1/3/0/7/130775682/vorebigugo-jizefo-gelal-nujifen.pdfIn PDF document text
    • https://cdn.sqhk.co/vavewiminiv/8hfiejh/vovitesaz.pdfIn PDF document text
    • https://konilusikiwi.weebly.com/uploads/1/3/3/9/133986353/juzunapogoza-vewokudeguvizub-jadototipok.pdfIn PDF document text
    • https://cdn.sqhk.co/tilomulobet/IgdMrif/84534985516.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0298dc5a-7924-4276-8279-06452a5288da.filesusr.com/ugd/b30cf0_a58de49af35d446698ae0f3a33883813.pdf?index=trueIn PDF document text
    • http://jupafikita.rf.gd/reading_the_old_testament_in_chronological_order.pdfIn PDF document text
    • http://siparedobapu.rf.gd/sawegajesupuwisejagup.pdfIn PDF document text
    • http://zavujosabojid.rf.gd/android_bottomnavigationview_fragment.pdfIn PDF document text
    • http://rufedum.rf.gd/hybridization_biology.pdfIn PDF document text
    • http://serezisegani.rf.gd/23274018916.pdfIn PDF document text
    • https://7f3356c1-ec1f-498a-9d41-5b36c14d87b7.filesusr.com/ugd/98d33d_14ccb1edd1e641feb688e9083eb08bf0.pdf?index=trueIn PDF document text
    • http://boxulinizisa.epizy.com/jeux_pour_apprendre_le_francais.pdfIn PDF document text
    • http://dirunexodov.rf.gd/intermediary_guidelines_amendment_rules_2018.pdfIn PDF document text
    • https://e5eb5b25-b33c-43e3-82d5-57ab1bf863d8.filesusr.com/ugd/b0c717_c9a2b0bb8a5c4af083f121c35920d82c.pdf?index=trueIn PDF document text
    • https://3d7304b5-8527-495f-b913-615d6f357a43.filesusr.com/ugd/ef7486_f8944fb2eb254ed3b8dd4311f70cdad5.pdf?index=trueIn PDF document text
    • http://zebigibozudival.epizy.com/introduction_to_geometry_worksheet_algebra_nation.pdfIn PDF document text
    • https://7a48fde5-f9d1-4ce4-84a2-8b156d245d18.filesusr.com/ugd/8127dd_7297442932324358a748830b40787af8.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_off00010135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10135 5740 bytes
SHA-256: 396753dcf81c89b8fbd1dcd0bf78c28e4e9c9b4b2dbfc0ed24e0342f1be6d715
font_01_sfnt_off000114b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B2 11016 bytes
SHA-256: aad8eb3f1b4986e8df331d1ccd729e889f417957718aef82b9549e2f009e0be3