Malicious PDF — malware analysis report

Static analysis result for SHA-256 bece4c897ca2a65b…

MALICIOUS

PDF

66.6 KB Created: 2021-06-08 00:52:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: a0a0383816d5b98a11341279852c7dc8 SHA-1: c4e55c42eecadbde6a1dc208128cfc80b69cb5a7 SHA-256: bece4c897ca2a65bd6df2478f7a8278fe97e77394ec7b64bef2398a260a03019
186 Risk Score

Malware Insights

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

This PDF document was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The primary URL points to a resource that claims to be a "slope intercept form worksheet answer key", likely a lure to direct users to a potentially malicious website.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pistant.ru/pbw?utm_term=slope+intercept+form+worksheet+answer+key PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4490125/normal_601325d8cc14d.pdfIn PDF document text
    • https://ravawesasusede.weebly.com/uploads/1/3/4/5/134517270/5795865.pdfIn PDF document text
    • https://jatevabuxises.weebly.com/uploads/1/3/5/3/135382810/7435434.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485318/normal_5ff2b971e5f67.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452395/normal_605420b311374.pdfIn PDF document text
    • https://xebexusutawa.weebly.com/uploads/1/3/4/5/134502291/difugapofagasugut.pdfIn PDF document text
    • https://dumasibomis.weebly.com/uploads/1/3/4/6/134642495/givojasabewuzipakel.pdfIn PDF document text
    • https://gunimumatepatu.weebly.com/uploads/1/3/5/3/135313318/9d1b1e3cd14.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455669/normal_5ffe83e5e7443.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/c38e080d-0c16-40de-ba84-6c21e01d5837/hayward_power_flo_matrix_1_1_2_hp.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0554b1ab-093b-4499-94ee-a75a33034964/student_brag_sheet_for_letter_of_recommendation_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/561179f3-0ce6-40ca-bb77-1d7841cdcbdb/attack_on_titan_manga_season_4_manga.pdfIn PDF document text
    • http://pesivop.pbworks.com/w/file/fetch/144632721/autodwg_to_dwg_converter_2019_serial_number.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d01e7a13-df67-4840-aa1c-d322c306a58d/how_to_adjust_spacing_in_powerpoint_text_box.pdfIn PDF document text
    • http://nilanom.pbworks.com/w/file/fetch/144424914/33941673130.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0e5e409-fc2c-478c-a7af-a51504f6229b/all_the_things_you_are_jazz_piano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8304f619-ee10-4110-9d89-35da22cb21ac/74382026907.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b19f81cb-8ae8-48a5-a452-673c601960b4/94446921205.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74c94c48-e11a-49f0-a7bf-88acee6bde78/lopunegorukop.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_off0000c7e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E4 5616 bytes
SHA-256: 502e518da8c3e5cf487afc89cf7faf2aa444b3065bcce2780a32bae3bfc797a4
font_01_sfnt_off0000daed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAED 9976 bytes
SHA-256: a0111c75c8e8fba368b664d20ea1c4239065908f0d47cfeb4fcf6fcaaf62c5d7