Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec5606d681b69788…

MALICIOUS

PDF

74.8 KB Created: 2021-06-10 15:05:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 81ba0e95ebd5f45641e9030a79e2e7d2 SHA-1: ee81b0c3622c1123c26c7b8fc72eb42857269da7 SHA-256: ec5606d681b6978878803f294ece166bb135dfdefa5f5480732e34b23e426daa
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. One of the primary URLs, 'https://laborke.ru/pbw?utm_term=autocad+lt+2021+crack', indicates a lure for cracked software. No scripts were extracted, but the PDF structure and numerous external links are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://laborke.ru/pbw?utm_term=autocad+lt+2021+crack PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4469852/normal_5fdf4b6af3f61.pdfIn PDF document text
    • https://befadileniralan.weebly.com/uploads/1/3/6/0/136082268/76f26e02b.pdfIn PDF document text
    • https://duzezefoge.weebly.com/uploads/1/3/1/4/131437668/3029086.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455380/normal_5fce2c3dda734.pdfIn PDF document text
    • https://duwizule.weebly.com/uploads/1/3/4/6/134663296/1738286.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426954/normal_60228c652ccde.pdfIn PDF document text
    • https://viwexiwi.weebly.com/uploads/1/3/5/3/135318047/5ee3ae8b27f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366622/normal_603f6a179c5a9.pdfIn PDF document text
    • https://nekazadezi.weebly.com/uploads/1/3/4/6/134662300/buref.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/6520f01d-1688-45c2-80ae-df9f78886653/gugiserewekibopoxivo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57ec0789-f2db-45c1-bdba-be08497d6abc/tuxez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/346aa4f5-8b42-4cfb-90f0-00e1d11efd2c/hp_laserjet_2100tn_driver_download_windows_xp.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff775ecd-a9ad-47eb-94fb-fdc94ccea600/98985932992.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4360ce22-98f2-487a-8869-cc5b30cec6a4/how_to_make_google_open_apple_maps.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/689ebd4b-5d9c-4fed-9bee-2a005c4d4ef5/weaknesses_of_north_face_jacket_cheap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aaf07415-ff46-4943-b996-9961378ba7a4/winirevixu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b576755-55f3-4ccb-9022-0037dc2399ff/firofufipos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ded72f9-a041-4d9c-994b-03c570387954/the_rabbit_who_wants_to_fall_asleep_audio_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c2e9e83-f48f-4c80-a0a0-a4ca02b19612/what_is_the_icd_10_code_for_major_depression.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/221fb47c-e88b-40b4-97a3-2418ae609dcc/wifijogote.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D7 5132 bytes
SHA-256: 23924368879319135aec00274717bc237751733a50d715b1ec06fd64c3f9dfe8
font_01_sfnt_off0000f765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF765 11000 bytes
SHA-256: 0f9b795265f0fce714f2650dd84470b5be9442efe0277b9f52709810dc02e648