Malicious PDF — malware analysis report

Static analysis result for SHA-256 63cf704de1e1bd8c…

MALICIOUS

PDF

105.7 KB Created: 2021-03-20 03:29:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: abbcae8b49f3c7299e70bd6707f4b17a SHA-1: c36ced2c29ff97e05ac694799e259593300f6172 SHA-256: 63cf704de1e1bd8c09e452cce5b95c65a77b338238912320c0620172a52d6d91
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://seumenha.ru/123?utm_term=princeton+instruments+spectrometer+manual PDF link annotation
    • http://sixesijilolun.mywebcommunity.org/25145262950.pdfIn PDF document text
    • http://xafesuvorolivig.scienceontheweb.net/all_of_me_chords_sheet_music.pdfIn PDF document text
    • http://pefiworawodud.mypressonline.com/govonafejanideg.pdfIn PDF document text
    • http://pewekelexu.mygamesonline.org/aviation_english_book.pdfIn PDF document text
    • https://cdn.sqhk.co/xijisejes/oHjaTgd/jofebitewegevejetufofu.pdfIn PDF document text
    • http://dapurixid.sportsontheweb.net/paparobejijino.pdfIn PDF document text
    • https://cdn.sqhk.co/faroziwe/frDgdQA/26229986470.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
    • https://uploads.strikinglycdn.com/files/540c4ba0-a4a2-421b-b76d-0cd93570edba/saffire_pro_40_tutorial.pdfIn PDF document text
    • https://f37c3615-20b0-4e70-b1e7-2acf34113780.filesusr.com/ugd/1e533a_f0f32612b5b14b7680c1d228eb8e65ed.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ea5b757-9b83-4ef2-963a-1a1437606c51/language_teaching_approach.pdfIn PDF document text
    • http://gosaduzunake.myartsonline.com/33378050050.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b62402dc-fd3d-4b01-9791-f20d9686b589/zugoxujiguzajubok.pdfIn PDF document text
    • http://vewawisu.onlinewebshop.net/75263083459.pdfIn PDF document text
    • https://b5f169ef-6bcf-4d19-a24b-32bdc9dd7a5f.filesusr.com/ugd/2e79a6_69e802d6d0cd4f92ba8db00e111987ab.pdf?index=trueIn PDF document text
    • http://mijemem.rf.gd/industrial_alliance_group_insurance_forms.pdfIn PDF document text
    • http://bemunaxeje.epizy.com/juvenile_delinquency_world_youth_report_2003.pdfIn PDF document text
    • https://d5f1d3db-1598-48d0-a061-764c190a6564.filesusr.com/ugd/866690_d4918c184ba84461847e720a4e909c25.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/414fa214-e8e2-4e32-843a-1eb639447cf8/38545130110.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_off00015087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15087 4964 bytes
SHA-256: a52f5ca50988167579ead063d096669ceb535555b1a600331b3228e13bb31ba0
font_01_sfnt_off0001613a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1613A 11660 bytes
SHA-256: 70f66c3856c2a4ee052f64c6b04c0a7b38111cbef4a3e97099a46f7073f8c0d0
font_02_sfnt_off0001894e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1894E 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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